Tootfinder

Datadog is joining the S&P 500, replacing Juniper Networks after HPE acquired Juniper, before trading on July 9; DDOG jumps 10% after hours (Jordan Novet/CNBC)
https://www.cnbc.com/2025/07/02/datadog-stock-jumps-sp-500-index-inclusion.html

Datadog stock jumps 10% on tech company’s inclusion in S&P 500 index
Hewlett Packard Enterprise's closing of its Juniper deal created an opening in the index, which has added several technology companies in recent months.

#NorskTut #Norge:
https://lokalhistoriewiki.no/index.php?…

Getting started with Shiny to make interactive web-apps with R: #rstats

Overview | Building Web Apps with R Shiny
This class will teach you the basics of Shiny app programming, giving you skills that will form the basis of almost any app you want to build. By the end of the class, you will have created a custom app that collects and saves data, allows users to dynamically visualize the data, and produces downloadable reports.

It's still raw and rough but one or two people asked about using some of the graphics I've been creating lately... so here they are.
Use them, no license, no credit needed. Just don't be a bad person, cool?
http://apps.2xlnetworks.net/files/
I will add a pretty index at some po…

Please join me on July 7th for next month's MediaEd Club webinar for the Media Education Lab: "Privacy, Power, and Platforms"
https://mediaeducationlab.com/index.php/events/privacy-power-and-platforms
If you missed today's / this month…

»Social Media Matrix – Kurznachrichtendienste im Vergleich«
Falls wer noch weitere positive Argumente für Mastodon benötigt, dann kann mensch ja mal hier nachsehen und außerhalb vom Fediverse weiter teilen.
P.S. Das Fediverse ist einiges mehr als nur Mastodon (ich weiss ihr wisst es).
👉 https://social-me…

Social Media Matrix • King Consult
Social Media im Vergleich: Mastodon, Bluesky, Threads oder X? Warum das Fediverse langfristig die beste Wahl für Behörden, Verbände, Wissenschaft und Journalismus ist.

This https://arxiv.org/abs/2505.12518 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Bounds on Trees with Topological Indices Among Degree Sequence
In this paper, we investigate The relationship between the Albertson index and the first Zagreb index for trees. For a tree $T=(V,E)$ with $n=|V|$ vertices and $m=|E|$ edges, we provide several bounds and exact formulas for these two topological indices, and we show that the Albertson index $\irr(T)$ and the first Zagreb index $M_1(T)$ satisfy the association \[ \operatorname{irr}(T)=d_1^2+d_n^2+(n-2)\left(\frac{Δ+ δ}{2}\right)^2+\sum_{i=2}^{n-1} d_i+d_n - d_1-2n-2.\] Our …

@… That's what I thought too! There seems to be some contention on this. From this https://www.timstinchcombe.co.uk/index.php?pge=diode &am…

Loose rectangular diagram, multi-crossing number, and arc index
Tetsuya Ito
https://arxiv.org/abs/2507.01404 https://arxiv.org/pdf/25…

Loose rectangular diagram, multi-crossing number, and arc index
For a non-split multi-crossing diagram $D$ of a link $L$ we show that $α(L)-2 \leq c_2(D) + \sum_{n> 2}(2n-4)c_n(D)$ holds. Here $α(L)$ is the arc index and $c_n(D)$ is the number of $n$-crossings of $D$. This generalizes and subsumes many known inequalities related to multi-crossing numbers. In the course of proof, we introduce a notion of loose rectangular diagram and show that a loose rectangular diagram can be converted to usual rectangular diagram preserving its arc index.

Stop Chasing the C-index: This Is How We Should Evaluate Our Survival Models
Christian Marius Lillelund, Shi-ang Qi, Russell Greiner, Christian Fischer Pedersen
https://arxiv.org/abs/2506.02075

Stop Chasing the C-index: This Is How We Should Evaluate Our Survival Models
We argue that many survival analysis and time-to-event models are incorrectly evaluated. First, we survey many examples of evaluation approaches in the literature and find that most rely on concordance (C-index). However, the C-index only measures a model's discriminative ability and does not assess other important aspects, such as the accuracy of the time-to-event predictions or the calibration of the model's probabilistic estimates. Next, we present a set of key desiderata for choosing the ri…

Je me demandais comment se finançais @… si la grosse partie revient Š la #SNCF logiquement un peut de 2.5% (avant frais bancaire) permettent de financer ce nouveau service.

Finite index theorems for iterated Galois groups of preperiodic points for unicritical polynomials
Minsik Han, Thomas J. Tucker
https://arxiv.org/abs/2508.00266 https://

Finite index theorems for iterated Galois groups of preperiodic points for unicritical polynomials
Let K be a number field and let f(x) = x^q + c where q is a prime power, c is in K, and f is not post-critically finite. We show that for any strictly preperiodic b in K, the iterated Galois group at b with respect to f has finite index in the generic iterated Galois group for f.

Pinching-Antenna-Assisted Index Modulation: Channel Modeling, Transceiver Design, and Performance Analysis
Shuaixin Yang, Yijia Li, Yue Xiao, Yong Liang Guan, Xianfu Lei, Zhiguo Ding
https://arxiv.org/abs/2507.02641

Pinching-Antenna-Assisted Index Modulation: Channel Modeling, Transceiver Design, and Performance Analysis
In this paper, a novel pinching-antenna assisted index modulation (PA-IM) scheme is proposed for improving the spectral efficiency without increasing the hardware complexity, where the information bits are conveyed not only by the conventional M-ary quadrature amplitude modulation (QAM) symbols but also by the indices of pinching antenna (PA) position patterns. To realize the full potential of this scheme, this paper focuses on the comprehensive transceiver design, addressing key challenges in …

#FotoDerWoche mit Freiburger Wolken.
https://blog.till-westermayer.de/index.php/2025/08/02/photo-of-the-week-freiburg-hbf-in-the-e…

Photo of the week: Freiburg Hbf in the evening light
Kein ganz neues Motiv, aber immer wieder hübsch: der Freiburger Hauptbahnhof mit Wolken und sich spiegelnden Wolken.

De ware aard van de chipsdoos van Lays - #Zwerfinator
https://zwerfinator.nl/index.php/2025/06/01/de-ware-aard-van-de-chipsdoos-van-lays/…

(1/3) Please join me today on Zoom at 12pm ET / 11am CT / 10am MT / 9am PT for "Beyond the Algorithmic Feed," a free MediaEd Club webinar for the Media Education Lab:
https://mediaeducationlab.com/index.php/events/beyond-algorithmic-feed
While som…

Enriching the Felsenthal index with a priori unions for decision-making processes
Alicia Mascare\~nas-Pazos, Silvia Lorenzo-Freire, Jose Maria Alonso-Meijide
https://arxiv.org/abs/2507.01621

Enriching the Felsenthal index with a priori unions for decision-making processes
Within the domain of game theory, power indexes are defined as functions that quantify the influence of individual participants in collective decision-making processes. Felsenthal [D. Felsenthal. A Well-Behaved Index of a Priori P-Power for Simple N-Person Games. Homo Oeconomicus, 33, 2016] proposed a power index with a focus on least size winning coalitions, i.e., those coalitions capable of determining the final outcome and with the smallest number of players among all winning coalitions. How…

Introducing a New Brexit-Related Uncertainty Index: Its Evolution and Economic Consequences
Ismet Gocer, Julia Darby, Serdar Ongan
https://arxiv.org/abs/2507.02439

Introducing a New Brexit-Related Uncertainty Index: Its Evolution and Economic Consequences
Important game-changer economic events and transformations cause uncertainties that may affect investment decisions, capital flows, international trade, and macroeconomic variables. One such major transformation is Brexit, which refers to the multiyear process through which the UK withdrew from the EU. This study develops and uses a new Brexit-Related Uncertainty Index (BRUI). In creating this index, we apply Text Mining, Context Window, Natural Language Processing (NLP), and Large Language Mod…

Borussia hat es mal wieder geschafft: Statt konsequent zu handeln, bleibt der Verein im Neuhaus-Dauertheater gefangen. Die Autorität des Sportdirektors? Auf Null. Die Chance, einen klaren Schnitt zu machen? Verpasst. Am Ende bleibt das Sprichwort: Lieber ein Ende mit Schrecken, meint #Seitenwahl
#Borussia

Seitenwahl.de – Neuhaus - eine Sommertragödie

Verifying Properties of Index Arrays in a Purely-Functional Data-Parallel Language
Nikolaj Hey Hinnerskov, Robert Schenck, Cosmin E. Oancea
https://arxiv.org/abs/2506.23058

Verifying Properties of Index Arrays in a Purely-Functional Data-Parallel Language
This paper presents a novel approach to automatically verify properties of pure data-parallel programs with non-linear indexing -- expressed as pre- and post-conditions on functions. Programs consist of nests of second-order array combinators (e.g., map, scan, and scatter) and loops. The key idea is to represent arrays as index functions: programs are index function transformations over which properties are propagated and inferred. Our framework proves properties on index functions by distillin…

A Combinatorial Study of the Fixed Point Index
Jes\'us A. \'Alvarez L\'opez, Alejandro O. Majadas-Moure, David Mosquera-Lois
https://arxiv.org/abs/2505.24530

A Combinatorial Study of the Fixed Point Index
We introduce a theory of integration with respect to the fixed point index, offering a substantial improvement over previous approaches based on the Lefschetz number. This framework eliminates several restrictive assumptions -- such as the need for definability, openness, or f-invariance of subspaces -- thereby allowing broader applicability. We also present a natural combinatorial adaptation of the fixed point index that extends the combinatorial Lefschetz number. This extension yields new top…

The @… crew are doing a group order of meshtastic wireless devices.
We've selected the Wismesh Pocket v2 plus a small card sized sensor / buzzer. These connect up to 7 hops and we'll be installing 2 solar powered repeaters in Gastown & Mt Pleasant (as well as direct between any two devices)
Fill out the form …

My question about the PTSN switch-off campaign is: can BT not already *detect* (over the course of a year) which customers are using alarms or telecare devices likely to be impacted?
https://www.ispreview.co.uk/index.php/2025

Government Hails Start of National Campaign for UK Digital Phone Switch
The UK government has today hailed the start of a new national campaign, funded by broadband giants BT and Virgin Media, which aims to help support and encourag

Podcast-Empfehlung für die Hefebäcker unter euch: Die letzten beiden Folgen der Sendung "Alles in Butter" des WDR5 drehen sich um frische Backhefe bzw. Trockenhefe. Ich habe aus Gründen nur die Sendung zur frischen Hefe gehört und darin dabei richtig viel über Hefe gelernt. Nachzuhören hier, ggf. müsst ihr ein Stück weit in die vorhergehenden Sendungen runter scrollen:

WDR 5 Alles in Butter
Alltagsrezepte und kulinarische Tipps zum Genießen – mit Carolin Courts und Uwe Schulz in der Moderation sowie dem Genussexperten Helmut Gote.

All You Need Is Binary Search! A Practical View on Lightweight Database Indexing on GPUs
Justus Henneberg, Felix Schuhknecht
https://arxiv.org/abs/2506.01576

All You Need Is Binary Search! A Practical View on Lightweight Database Indexing on GPUs
Performing binary search on a sorted dense array is a widely used baseline when benchmarking sophisticated index structures: It is simple, fast to build, and indexes the dataset with minimal memory footprint. However, the popular opinion is that it cannot compete with sophisticated indexes in terms of lookup performance, and hence, should not actually be considered in practice. Interestingly, in our recent works on (even more sophisticated) GPU-resident index structures, we observed the surpr…

Indexing Tries within Entropy-Bounded Space
Lorenzo Carfagna, Carlo Tosoni
https://arxiv.org/abs/2507.02728 https://arxiv.org/pdf/250…

Indexing Tries within Entropy-Bounded Space
We study the problem of indexing and compressing tries using a BWT-based approach. Specifically, we consider a succinct and compressed representation of the XBWT of Ferragina et al.\ [FOCS '05, JACM '09] corresponding to the analogous of the FM-index [FOCS '00, JACM '05] for tries. This representation allows to efficiently count the number of nodes reached by a given string pattern. To analyze the space complexity of the above trie index, we propose a proof for the combinatorial problem of coun…

Survey: local news outlets make up 51% of INN's 500 members, digital-first outlets employ ~3,200 journalists, foundation funding is 49% of revenue, and more (INN News)
https://news.inn.org/highlights-2025-inn-index/

Increase in local members and topical news coverage: Highlights from the 2025 INN Index survey - INN News
For the first time, local news outlets make up the largest segment of the Institute for Nonprofit News’ member network, according to the latest Index survey.

⏱️ Poor man's bitemporal data system in SQLite and Clojure
#database

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
Seth Nelson, Cong Yu, Daniel Watson, Shahrzad Ramtinfard, Miguel Levy
https://arxiv.org/abs/2507.02093

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
The interaction between light's angular momentum (AM) and material systems has unlocked new avenues in structured photonics, including in magneto-optical (MO) materials. While spin angular momentum (SAM) effects in MO systems are well-established, orbital angular momentum (OAM) introduces novel opportunities for new nonreciprocal light-matter interactions. In this study, we demonstrate a unique optical phenomenon where OAM states undergo state-specific nonreciprocal operation within an MO mediu…

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems
Levi Lorenzo
https://arxiv.org/abs/2505.24135 https://a…

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems
We study index pairings for crossed-product $C^*$-algebras arising from minimal actions on the Cantor set. We utilize Putnam's orbit-breaking AF-subalgebras and embeddings to show we can compute any index pairing for Cantor minimal system crossed products using Connes' trace formulas. In the case of odometers, we show that the associated algebras have uniformly finitely summable $K$-homology.

Trouvaille im #Bildindex von #FotoMarburg aus Anlass der Bildpool-Übertragung in #DSpace: der vorletzte Scan von 1.686.784 Microfiches enthält einen speziellen Gruß der

Meine Science-Fiction und Fantasy-Besprechungen für den Mai sind online. Mit For All Mankind, Nils Westerboers neuem Roman Lyneham (den ich sehr empfehle) und der Hidden-Seas-Reihe von A.M. Dellamonica.
https://blog.till-westermayer.de/index.ph…

Science Fiction und Fantasy im Mai 2025
For All Mankind (Apple TV) funktioniert für mich einfach. Ich habe gerade das Finale der Staffel 4 gesehen (das in einer alternativen Realität in einer Marskolonie im Jahr 2012 endet), und bin begeistert davon, weil die Serie es schafft, Politik, halbwegs plausible Wissenschaft bzw. halbwegs plausib

Stop using #teflon products.
You #cyclists: avoid all #PTFE lubricants. Get Green Oil instead.
It's the most abundant micro plastic now in your

Die Folien zu meinem Vortrag "FAIR, really? Zur Nutzbarkeit von Kulturerbedaten" auf der #bibliocon2025 sind jetzt online: https://opus4.kobv.de/opus4-bib-info/f

"The Bib Record in the Age of Digital Reproduction" https://journal.radicallibrarianship.org/index.php/journal/article/view/135
"Taking both structural and thematic inspiration from Walter Benjamin’s “The Work of Art in the Age of Mechanic…

NaviX: A Native Vector Index Design for Graph DBMSs With Robust Predicate-Agnostic Search Performance
Gaurav Sehgal, Semih Salihoglu
https://arxiv.org/abs/2506.23397

NaviX: A Native Vector Index Design for Graph DBMSs With Robust Predicate-Agnostic Search Performance
There is an increasing demand for extending existing DBMSs with vector indices so that they become unified systems capable of supporting modern predictive applications, which require joint querying of vector embeddings together with the structured properties and connections of objects. We present NaviX, a native vector index for graph DBMSs (GDBMSs) that has two main design goals. First, we aim to implement a disk-based vector index that leverages the core storage and query-processing capabilit…

Defects Potentials for Two-Dimensional Topological Materials
Yuval Abulafia, Amit Goft, Nadav Orion, Eric Akkermans
https://arxiv.org/abs/2507.01530 https:…

Defects Potentials for Two-Dimensional Topological Materials
For non-topological quantum materials, introducing defects can significantly alter their properties by modifying symmetry and generating a nonzero analytical index, thus transforming the material into a topological one. We present a method to construct the potential matrix configuration with the purpose of obtaining a non-zero analytical index, akin to a topological invariant like a winding or Chern number. We establish systematic connections between these potentials, expressed in the continuum…

[Blog] Journée mondiale de jeu
#convention
https://debellum.hirlimann.net/index.php?post/2025/06/01/Journée-mondiale-de-jeu

I've been remiss in posting Toy Camera photos but I've added some new ones!
➡️ http://photos.rasterweb.net/index.php?/category/33
#ShittyCameraChallenge…

Tel Aviv-based Wonderful, which develops customer support AI agents for businesses in non-English speaking countries, raised a $34M seed led by Index Ventures (Yuliya Chernova/Wall Street Journal)
https://www.wsj.com/articles/wonderfu…

This https://arxiv.org/abs/2407.17708 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

The index of lattice Dirac operators and $K$-theory
We mathematically show an equality between the index of a Dirac operator on a flat continuum torus and the $η$ invariant of a lattice Dirac operator known as the Wilson Dirac operator with a negative mass when the lattice spacing is sufficiently small. Unlike the standard approach, our formulation using $K$-theory does not require modified chiral symmetry on the lattice. We prove that a one-parameter family of continuum massive Dirac operators and the corresponding Wilson Dirac operators belon…

The bridge index and the braid index for twist positive knots
Keisuke Himeno
https://arxiv.org/abs/2507.23252 https://arxiv.org/pdf/2507.23252

The bridge index and the braid index for twist positive knots
In this paper, we study the relationship between the bridge index and the braid index for twist positive knots. A knot is said to be twist positive if it admits a positive braid representative that contains at least one full twist. Motivated by a conjecture of Krishna and Morton, we investigate this relationship via the knot Floer torsion order. As a consequence, we show that the bridge index and the braid index coincide for all twist positive knots.

Linkdump 22/2025 – #fundstücke

Born at PPM site ... =
"parts-per-million – ppm, 10−6"
referenced from https://en.wikipedia.org/w/index.php?title=Parts-per_notation&oldid=1299770504
"Carbon dioxide in the atmosphere of Earth"
There are…

Parts-per notation - Wikipedia

The Local Structure Theorem for Graph Minors with Finite Index
Christophe Paul, Evangelos Protopapas, Dimitrios M. Thilikos, Sebastian Wiederrecht
https://arxiv.org/abs/2507.02769

The Local Structure Theorem for Graph Minors with Finite Index
The Local Structure Theorem (LST) for graph minors roughly states that every $H$-minor free graph $G$ that contains a sufficiently large wall $W$, there is a set of few vertices $A$ such that, upon removing $A$, the resulting graph $G':=G - A$ admits an "almost embedding" $δ$ into a surface $Σ$ in which $H$ does not embed. By almost embedding, we mean that there exists a hypergraph $\mathcal{H}$ whose vertex set is a subset of the vertex set of $G$ and an embedding of $\mathcal{H}$ in $Σ$ su…

I have visited this small National Monument several times - it is very much worth a visit.
I fear that it, however, is near the top of FFOTUS' list of national monuments to dismantle.
Cesar Chavez National Monument
https://www.nps.gov/cech/index.htm

César E. Chávez National Monument (U.S. National Park Service)
Yes, we can!

Widely recognized as the most important Latino leader in the United States during the twentieth century, Cesar Chavez led farm workers and supporters in the establishment of the country's first permanent agricultural union. His leadership brought sustained international attention to the plight of U.S. farm workers, and secured for them higher wages and safer working conditions.

Decentralized Pliable Index Coding For Federated Learning In Intelligent Transportation Systems
Sadina Kadakkottiri, Narisetty Harish, Nujoom Sageer Karat, Deepthi Paramel Pattathil, Balaji Sundar Rajan
https://arxiv.org/abs/2507.00643

Decentralized Pliable Index Coding For Federated Learning In Intelligent Transportation Systems
Federated Learning is a promising option for data privacy and security in ITS, because it allows edge devices, Road Side Units (RSUs), and Central Server (CS) to jointly train the machine learning model. Since RSU collects data from the vehicles passing through its range, the local data of each RSU will have a non-IID distribution, which adversely affects the convergence speed and accuracy of FL training. Generating synthetic data locally at individual nodes, followed by data shuffling among th…

Animals are abused and exploited in various ways for the sake of entertainment. LCA strongly opposes the use of animals in entertainment.
Animals have their own needs, interests, and rights, especially the right to engage in their natural behaviors in their natural habitat. https://www.lcanimal.org/…

My first, and maybe most notable, contribution to Wikipedia was the creation of [IBM] Token Ring page in October 2001. Some remnants of the original text surprisingly survive to this day: https://en.wikipedia.org/w/index.php?title=IBM_Token_ring&oldid=351771239…

Rigid affine cones over singular del Pezzo surfaces
In-Kyun Kim, Jaehyun Kim, Joonyeong Won
https://arxiv.org/abs/2506.01310 https://…

Rigid affine cones over singular del Pezzo surfaces
We completely determine the existence of anticanonical polar cylinders in quasi-smooth log del Pezzo surfaces of index one.

from my link log —
Compact representations for arrays in Lua.
https://sol.sbc.org.br/index.php/sblp/article/view/30252
saved 2025-06-22

This https://arxiv.org/abs/2503.16512 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csHC_…

Multimodal Sensing and Machine Learning to Compare Printed and Verbal Assembly Instructions Delivered by a Social Robot
In this paper, we compare a manual assembly task communicated to workers using both printed and robot-delivered instructions. The comparison was made using physiological signals (blood volume pulse (BVP) and electrodermal activity (EDA)) collected from individuals during an experimental study. In addition, we also collected responses of individuals using the NASA Task Load Index (TLX) survey. Furthermore, we mapped the collected physiological signals to the responses of participants for NASA TL…

Are Pixel-Wise Metrics Reliable for Sparse-View Computed Tomography Reconstruction?
Tianyu Lin, Xinran Li, Chuntung Zhuang, Qi Chen, Yuanhao Cai, Kai Ding, Alan L. Yuille, Zongwei Zhou
https://arxiv.org/abs/2506.02093

Are Pixel-Wise Metrics Reliable for Sparse-View Computed Tomography Reconstruction?
Widely adopted evaluation metrics for sparse-view CT reconstruction--such as Structural Similarity Index Measure and Peak Signal-to-Noise Ratio--prioritize pixel-wise fidelity but often fail to capture the completeness of critical anatomical structures, particularly small or thin regions that are easily missed. To address this limitation, we propose a suite of novel anatomy-aware evaluation metrics designed to assess structural completeness across anatomical structures, including large organs, …

Unbiased estimation in new Gini index extensions under gamma distributions
Roberto Vila, Helton Saulo
https://arxiv.org/abs/2506.00666 https://

Unbiased estimation in new Gini index extensions under gamma distributions
In this paper, we propose two new flexible Gini indices (extended lower and upper) defined via differences between the $i$-th observation, the smallest order statistic, and the largest order statistic, for any $1 \leqslant i \leqslant m$. For gamma-distributed data, we obtain exact expectations of the estimators and establish their unbiasedness, generalizing prior works by [Deltas, G. 2003. The small-sample bias of the gini coefficient: Results and implications for empirical research. Review of…

Reducing Hallucinations in Summarization via Reinforcement Learning with Entity Hallucination Index
Praveenkumar Katwe, Rakesh Chandra, Balabantaray Kali, Prasad Vittala
https://arxiv.org/abs/2507.22744

Reducing Hallucinations in Summarization via Reinforcement Learning with Entity Hallucination Index
Reducing hallucinations in abstractive summarization remains a critical challenge for deploying language models (LMs) in real-world settings. In this work, we introduce a rewarddriven fine-tuning framework that explicitly optimizes for Entity Hallucination Index (EHI), a metric designed to quantify the presence, correctness, and grounding of named entities in generated summaries. Given a corpus of meeting transcripts, we first generate baseline summaries using a pre-trained LM and compute EHI s…

I finally finished Houyhnhnm Computing, a wonderful exploration of an alternative approach to programming, and the advantages it would bring.
https://ngnghm.github.io/index.html
I’d highly recommend reading it. (At least, chapters 1–9 were great. Chapter 10 is about Urbit, which… ble…

This https://arxiv.org/abs/2505.23718 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCC_…

Fast Compressed-Domain N-Point Discrete Fourier Transform
This paper presents a novel algorithm for computing the N-point Discrete Fourier Transform (DFT) based solely on recursive Rectangular Index Compression (RIC) [1][2] and structured frequency shifts. The RIC DFT algorithm compresses a signal from $N=CL$ to $C\in[2,N/2]$ points at the expense of $N-1$ complex additions and no complex multiplication. It is shown that a $C$-point DFT on the compressed signal corresponds exactly to $C$ DFT coefficients of the original $N$-point DFT, namely, $X_{kL}$…

The Fordham University
Tri-State Tick Risk Index for the week of June 27, is at the highest it can be:
a 10 out of 10.
What’s listed next to that score is the following:
"If you’re thinking of taking a hike, consider going to a movie instead."
h…

Fordham Tri-State Tick Risk
The Fordham Tick Index is an estimate of the risk of being bitten by a nymphal or adult deer tick.

This https://arxiv.org/abs/2312.08923 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Topology change and heterotic flux vacua
We investigate the interrelation between topology and Narain T-duality of heterotic flux vacua. We present evidence that all 5 and 4-dimensional Minkowski space heterotic flux backgrounds with 8 supercharges have a locus in the moduli space with a T-dual description in terms of a compactification on the product of a K3 surface with a circle or a torus. A test of this equivalence is provided by calculating the new supersymmetric index on both sides of the duality. We examine the implications of …

Two different takes on the potential of AI for cataloguing in 'Catalogue and Index'
'Augmenting cataloguers' https://journals.cilip.org.uk/catalogue-and-index/article/view/750
'Smart enough to mislead'

On the proofs of Leighton's Graph Covering Theorem and a notion dual to commensurability
Nicholas Touikan
https://arxiv.org/abs/2507.01839 https://

On the proofs of Leighton's Graph Covering Theorem and a notion dual to commensurability
Leighton's Graph Covering Theorem states that if two finite graphs have the same universal covering tree, then they also have a common finite degree cover. Bass and Kulkarni gave an alternative proof of this fact using tree lattices. We give an example of two graphs that admit a common finite cover which can not be obtained using tree lattice techniques. The argument naturally leads to the question of when a commensuration can be induced by an embedding into a common finite index overgroup. We …

This https://arxiv.org/abs/2501.12905 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
We study the influence of hyperons in binary neutron star (NS) mergers considering a total of 14 temperature dependent equations of state (EoSs) models which include hyperonic degrees of freedom and partly delta resonances. Thermally produced hyperons induce a higher heat capacity and a lower thermal index, i.e. a reduced thermal pressure for a given amount of thermal energy, compared to purely nucleonic models. We run a large set of relativistic hydrodynamics simulations of NS mergers to explo…

Replaced article(s) found for math.DS. https://arxiv.org/list/math.DS/new
[1/1]:
- Morse index theorem for heteroclinic, homoclinic and halfclinic orbits of Lagrangian systems
Xijun Hu, Alessandro Portaluri, Li Wu, Qin Xing

Hoy en Xixón, apoyando a las seis de La Suiza. Otro capítulo en el golpe de estado del “quien pueda hacer que haga”.
https://www.sindicatodeestudiantes.net/index.php/no…

Computing matrix $\varphi$-functions arising in exponential integrators
Awad H. Al-Mohy, Xiaobo Liu
https://arxiv.org/abs/2506.01193 https://

Computing matrix $φ$-functions arising in exponential integrators
A new scaling and recovering algorithm is proposed for simultaneously computing the matrix $φ$-functions that arise in exponential integrator methods for the numerical solution of certain first-order systems of ordinary differential equations (ODEs). The algorithm initially scales the input matrix down by a nonnegative integer power of two, then computes the $[m/m]$ diagonal Padé approximant to $φ_p$, where $p$ is the largest index of interest. The remaining $[m+p{-}j/m]$ Padé approximants …

High resolution radio analysis of the starburst galaxy NGC 4527: signatures of an AGN core
C. A. Galante, G. E. Romero, J. Saponara, P. Benaglia
https://arxiv.org/abs/2507.02204

High resolution radio analysis of the starburst galaxy NGC 4527: signatures of an AGN core
NGC 4527 is a nearby edge-on spiral galaxy with both starburst and AGN features, hosting a LINER nucleus. We present a radio study of the large-scale structure and nuclear region of this galaxy, based on new uGMRT observations at 700 and 1230 MHz. Our continuum maps reveal extended emission tracing the stellar disk, with no evidence of a radio halo. The spectral index distribution and the presence of PAHs across the disk are consistent with ongoing star formation. In the nuclear region we resol…

A refinement of the Lorentz local field expression with impact on the Clausius-Mossotti and Lorentz-Lorenz models
Jeroen van Duivenbode, Anne-Jans Faber
https://arxiv.org/abs/2506.01993

A refinement of the Lorentz local field expression with impact on the Clausius-Mossotti and Lorentz-Lorenz models
In the 19th century Mossotti and Clausius formulated an expression that relates electrical permittivity of a dielectric to the product of molecular polarizability and number density. Lorenz and Lorentz extended the use of that expression to also cover the dielectric s refractive index. These expressions successfully predict the change of the dielectric s permittivity and refractive index as a function of a wide range of its number density, using the consideration that molecular polarizability s…

On some indices of foliations and applications
Arturo Fern\'andez-P\'erez, Evelia R. Garc\'ia Barroso, Nancy Saravia-Molina
https://arxiv.org/abs/2506.01090

On some indices of foliations and applications
In this paper we establish a relationship between the Milnor number, the $χ$-number, and the Tjurina number of a foliation with respect to an effective balanced divisor of separatrices. Moreover, using the Gómez-Mont--Seade--Verjovsky index, we prove that the difference between the multiplicity and the Tjurina number of a foliation with respect to a reduced curve is independent of the foliation. We also derive an adjunction formula for the Tjurina number of a foliation with respect to a reduc…

Söder, Musk, Meloni haben was gemeinsam.
https://blog.till-westermayer.de/index.php/2025/07/27/lesarten-von-science-fiction-die-dunkle-seite-der-macht/

Lesarten von Science Fiction: Die dunkle Seite der Macht
Vorbemerkung: ich habe diesen Text größtenteils bereits im April geschrieben - inzwischen hat sich das Verhältnis zwischen Musk und Trump deutlich verändert. Die Aussagen unten scheinen mir aber weiterhin Gültigkeit zu behalten ... Wie politisch sind Science Fiction und Fantasy? Schriftstellerinn

Power-Linear Polar Directional Fields
Jiabao Brad Wang, Amir Vaxman
https://arxiv.org/abs/2506.00222 https://arxiv.org/pdf/2506.00222…

Power-Linear Polar Directional Fields
We introduce a novel method for directional-field design on meshes, enabling users to specify singularities at any location on a mesh. Our method uses a piecewise power-linear representation for phase and scale, offering precise control over field topology. The resulting fields are smooth and accommodate any singularity index and field symmetry. With this representation, we mitigate the artifacts caused by coarse or uneven meshes. We showcase our approach on meshes with diverse topologies and t…

AutoIndexer: A Reinforcement Learning-Enhanced Index Advisor Towards Scaling Workloads
Taiyi Wang, Eiko Yoneki
https://arxiv.org/abs/2507.23084 https://arx…

AutoIndexer: A Reinforcement Learning-Enhanced Index Advisor Towards Scaling Workloads
Efficiently selecting indexes is fundamental to database performance optimization, particularly for systems handling large-scale analytical workloads. While deep reinforcement learning (DRL) has shown promise in automating index selection through its ability to learn from experience, few works address how these RL-based index advisors can adapt to scaling workloads due to exponentially growing action spaces and heavy trial and error. To address these challenges, we introduce AutoIndexer, a fram…

Sometimes {renv} just isnt enough to ensure your environment is controlled. Maybe {slushy} could be an option? https://gsk-biostatistics.github.io/slushy/index.html

Sources: Index Ventures' nearly $100M investment in Figma was worth $2.17B at the initial IPO price, while Greylock's $50M investment was worth $2.03B (Katie Roof/Bloomberg)
https://www.bloomberg.com/news/articles/202…

Air quality due to wildfire smoke still bad here in Northeast Kansas, but better than it was last night. Check the air quality in your area of the United States using:
#AirQuality

Animals are abused and exploited in various ways for the sake of entertainment. LCA strongly opposes the use of animals in entertainment.
Animals have their own needs, interests, and rights, especially the right to engage in their natural behaviors in their natural habitat. https://www.lcanimal.org/…

This https://arxiv.org/abs/1509.07195 has been replaced.
link: https://scholar.google.com/scholar?q=a

The Clifford algebra of a finite morphism
We develop a general theory of Clifford algebras for finite morphisms of schemes and describe applications to the theory of Ulrich bundles and connections to period-index problems for curves of genus 1.

Combinatorial Multi-Access Coded Caching with Private Caches under Intersecting Index Constraints
Dhruv Pratap Singh, Anjana A. Mahesh, B. Sundar Rajan
https://arxiv.org/abs/2506.24060

Combinatorial Multi-Access Coded Caching with Private Caches under Intersecting Index Constraints
We consider the coded caching system where each user, equipped with a private cache, accesses a distinct r-subset of access caches. A central server housing a library of files populates both private and access caches using uncoded placement. In this work, we focus on a constrained indexing regime, referred to as the intersection class, in which the sets used to index the demands of each user must have a nonempty intersection. This regime models resource-limited IoT scenarios such as edge-assist…

A look at the National Trust for Local News under new CEO Tom Wiley, who is focused on stabilizing the nonprofit and its newspapers before buying more outlets (Liam Scott/Local News Initiative)
https://localnewsinitiative.northweste

Hitting Reset After Months of Turbulence, the National Trust for Local News Seeks Stability
Two days after Tom Wiley joined the National Trust for Local News in May as its new CEO, the organization announced that it was selling 21 of its Colorado newspapers to a for-profit Arizona-based company.

from my link log —
Tony Hoare on record handling. (1966)
https://archive.computerhistory.org/resources/text/Knuth_Don_X4100/PDF_index/k-9-pdf/k-9-u2293-Record-Handling-Hoare.pdf
saved 2…

Query Drift Compensation: Enabling Compatibility in Continual Learning of Retrieval Embedding Models
Dipam Goswami, Liying Wang, Bart{\l}omiej Twardowski, Joost van de Weijer
https://arxiv.org/abs/2506.00037

Query Drift Compensation: Enabling Compatibility in Continual Learning of Retrieval Embedding Models
Text embedding models enable semantic search, powering several NLP applications like Retrieval Augmented Generation by efficient information retrieval (IR). However, text embedding models are commonly studied in scenarios where the training data is static, thus limiting its applications to dynamic scenarios where new training data emerges over time. IR methods generally encode a huge corpus of documents to low-dimensional embeddings and store them in a database index. During retrieval, a semant…

Microsoft’s 2025 work trend index report found that many workers are increasingly grappling with “infinite workdays”,
which start before sunrise and stretch late into the night.
They are interrupted by some 270 pinging notifications along the way, about one every two minutes.
https://www.…

Breaking down the infinite workday
To unlock AI’s full potential, we need to clear one key barrier. A follow-up to the 2025 Work Trend Index.

#FotoDerWoche mit Ziege im Frühlings-Gegenlicht.
https://blog.till-westermayer.de/index.php/2025/05/31/photo-of-the-week-wildtal-walk-viii-go…

Photo of the week: Wildtal walk - VIII (goat)
Aufgrund der ganzen Italienfotos hinke ich etwas hinterher. Und bin erstaunt, wie grün - und zugleich wenig grün - die Landschaft Mitte April erst/schon aussah. Davon ist auf dieser bei einem Spaziergang durchs Wildtal entstandenen Aufnahme wenig zu sehen, dafür eine Ziege im Gegenlicht - auch schön

A Budgeted Multi-Level Monte Carlo Method for Full Field Estimates of Multi-PDE Problems
Niklas Baumgarten, Robert Kutri, Robert Scheichl
https://arxiv.org/abs/2506.01644

A Budgeted Multi-Level Monte Carlo Method for Full Field Estimates of Multi-PDE Problems
We present a high-performance budgeted multi-level Monte Carlo method for estimates on the entire spatial domain of multi-PDE problems with random input data. The method is designed to operate optimally within memory and CPU-time constraints and eliminates the need for a priori knowledge of the problem's regularity and the algorithm's potential memory demand. To achieve this, we build on the budgeted multi-level Monte Carlo framework and enhance it with a sparse multi-index update algorithm ope…

Statistical Insights into Flux and Photon Index Distributions of VHE FSRQs from Fermi-LAT Observations
Zahoor Malik, Sikandar Akbar, Zahir Shah, Ranjeev Misra, Athar A. Dar, Aaqib Manzoor, Sajad Ahanger, Zeeshan Nazir, Naseer Iqbal, Seemin Rubab, Javaid Tantry
https://arxiv.org/abs/2505.23338

Statistical Insights into Flux and Photon Index Distributions of VHE FSRQs from Fermi-LAT Observations
This study examines the flux and photon index distributions of 11 Very High Energy (VHE) Flat Spectrum Radio Quasars (FSRQs) using over 16 years of Fermi-LAT $γ$-ray data. The distributions reveal double lognormal profiles in both flux and index, primarily in the 3-day and 7-day binnings, supporting the ``two-flux-state hypothesis" for blazars. These profiles, which become insignificant at 30-day binning, suggest that shorter timescales are better at capturing distinct states, while longer tim…

"Einsatzgebiete von Künstlicher Intelligenz in wissenschaftlichen Bibliotheken – Praxis und Perspektiven": Bachelor-Arbeit von Carina Pizzini an der TH Köln: https://publiscologne.th-koeln.de/frontdoor/index/index/docId/2678

M2-brane indices on Higgs vacua
Chiung Hwang, Chang Lei, Yuezhang Tang
https://arxiv.org/abs/2507.23764 https://arxiv.org/pdf/2507.23764

M2-brane indices on Higgs vacua
As an exact count of protected states, the superconformal index provides a powerful probe into holography and quantum aspects of gravity, reproducing the Bekenstein-Hawking entropy of supersymmetric AdS black holes in the large-$N$ limit. As a step toward understanding quantum black hole microstates, we study the finite-$N$ index of the 3d ADHM quiver gauge theory, a UV description of the 3d $\mathcal N=8$ SCFT dual to M-theory on AdS$_4 \times S^7$. In this note, we analyze both microcanonical…

Hamiltonian paths in iterated line graphs
Jan Ekstein, Zuzana Kulh\'ankov\'a
https://arxiv.org/abs/2507.22596 https://arxiv.org/pdf/2507.22596

Hamiltonian paths in iterated line graphs
For integer $n$, the $n$-iterated line graph $L^n(G)$ of an undirected graph $G$ is defined to be $L(L^{n-1}(G))$, where $L^1(G)$ is the line graph $L(G)$ of $G$. In this paper we introduce hamiltonian path index. Hamiltonian path index, denoted by $h_p(G)$, is the minimum number $n$ such that $L^n(G)$ contains a hamiltonian path. We show that hamiltonian path index of $G$ exists for any graph $G$ and we set the exact value of hamiltonian path index for trees and discuss the problem about graph…

This https://arxiv.org/abs/2401.04391 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Kawamata-Miyaoka type inequality for canonical $\mathbb Q$-Fano varieties II: Terminal $\mathbb Q$-Fano threefolds
We prove an optimal Kawamata-Miyaoka type inequality for terminal $\mathbb Q$-Fano threefolds with Fano index at least $3$. As an application, we obtain that any terminal $\mathbb Q$-Fano threefold $X$ satisfies the following Kawamata-Miyaoka type inequality \[ c_1(X)^3 < 3c_2(X)c_1(X). \]

SSCard: Substring Cardinality Estimation using Suffix Tree-Guided Learned FM-Index
Yirui Zhan, Wen Nie, Jun Gao
https://arxiv.org/abs/2505.24312 https://…

SSCard: Substring Cardinality Estimation using Suffix Tree-Guided Learned FM-Index
Accurate cardinality estimation of substring queries, which are commonly expressed using the SQL LIKE predicate, is crucial for query optimization in database systems. While both rule-based methods and machine learning-based methods have been developed to optimize various aspects of cardinality estimation, their absence of error bounds may result in substantial estimation errors, leading to suboptimal execution plans. In this paper, we propose SSCard, a novel SubString Cardinality estimator tha…

#FotoDerWoche mit meheren Jahrzehnten Schularchitektur und Wolken.
https://blog.till-westermayer.de/index.php/2025/06/29/photo-of-the-week-asg-with-…

Photo of the week: ASG with clouds
Vor der Haustür keine Wildnis mehr, dafür bietet sich der weite Blick über mehrere Varianten Schulzentrum (und am Tag dieses Fotos zudem wunderschöne Wolkenformationen). Das ASG ("Albert-Schweitzer-Gymnasium") wird saniert, deswegen sind die Klassen in Container ausgelagert, der ganz im Hintergrund

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Takumi Koike, Yusuke Ito, Naohiko Sugita
https://arxiv.org/abs/2506.22582

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Ultrashort pulse lasers (USPLs) have attracted attention as tools capable of inducing unique phenomena by instantaneously generating regions with transiently modified properties (filaments) in the material. However, a comprehensive understanding of USPL-induced filaments remains elusive due to the complexity of their dynamics and insufficient imaging techniques to accurately capture them. In this study, we propose a novel methodology to measure the transient complex refractive index of filament…

The functions in the {withr} package allow to change your environment temporarily. E.g. create a temp file for a {testthat} test and clean it up afterwards. #rstats

Run Code With Temporarily Modified Global State
A set of functions to run code with safely and temporarily modified global state. Many of these functions were originally a part of the devtools package, this provides a simple package with limited dependencies to provide access to these functions.

Developing a Synthetic Socio-Economic Index through Autoencoders: Evidence from Florence's Suburban Areas
Giulio Grossi, Emilia Rocco
https://arxiv.org/abs/2506.23849

Developing a Synthetic Socio-Economic Index through Autoencoders: Evidence from Florence's Suburban Areas
The interest in summarizing complex and multidimensional phenomena often related to one or more specific sectors (social, economic, environmental, political, etc.) to make them easily understandable even to non-experts is far from waning. A widely adopted approach for this purpose is the use of composite indices, statistical measures that aggregate multiple indicators into a single comprehensive measure. In this paper, we present a novel methodology called AutoSynth, designed to condense potent…

Negative Refraction Makes a Perfect Lens
JB Pendry
https://arxiv.org/abs/2507.01682 https://arxiv.org/pdf/2507.01682

Negative Refraction Makes a Perfect Lens
With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those that do not propagate in a radiative manner. Such super lenses can be realised in the microwave band with current technology and a version operating at the frequency of visible light, but at short distances of a few nanometres, can be realised in…

The {purrr} package is a powerfull way to replace loops. The {furrr} package takes this approach one step further by parallel execution: #rstats

Apply Mapping Functions in Parallel using Futures
Implementations of the family of map() functions from purrr that can be resolved using any future-supported backend, e.g. parallel on the local machine or distributed on a compute cluster.

Low-dispersion low free-spectral-range Mach-Zehnder interferometer with long straight path lengths on silicon
Cael Warner
https://arxiv.org/abs/2507.01114 …

Low-dispersion low free-spectral-range Mach-Zehnder interferometer with long straight path lengths on silicon
Multiple Mach-Zehnder interferometers are constructed using fiber-Bragg grating couplers, y-branches, silicon waveguides, and/or broadband splitters in silicon on insulator strip waveguides to test the effect of variation in waveguide length between consecutive bends on the transmission gain spectrum, free-spectral range, group refractive index, and dispersion. Dispersion is mitigated by increasing the path length between consecutive bends of minimum radius. With long linear waveguide sections,…

Auch angesichts der Listenaufstellung vom Wochenende ein Blick auf das neue Wahlrecht in Baden-Württemberg: https://blog.till-westermayer.de/index.php/2025/05/27/das-neue-landtagswahlrecht-materialisiert-sich/

Das neue Landtagswahlrecht materialisiert sich
Wer als Baden-Württemberger*in bundesweit parteipolitisch unterwegs ist, kennt diesen Moment, in dem irgendwer nach der Landesliste fragt, und dann erst einmal erklärt werden muss, dass Wahlen im Ländle anders funktionieren: nur Direktkandidat*innen in 70 Wahlkreisen, eine Zweitauszählung, um den Pr

#FotoDerWoche mit einem Stück Berliner Mauer in künstlerischer Auseinandersetzung.
https://blog.till-westermayer.de/index.php/2025/07/27/photo-of-the-we…

Photo of the week: Berlin wall
Anfang Juli war ich in Berlin und hatte ein Hotelzimmer in der Nähe der Mauergedenkstätte. Da ist dieses Foto entstanden - eine von meheren künstlerischen Installationen, die sich mit der ehemaligen Berliner Mauer, den Mauertoten und der Teilung der Stadt auseinandersetzen.

Ein letztes #FotoDerWoche von meiner österlichen Italienreise - hier ein Abstecher von Florenz ans Mittelmeer bei Livorno.
https://blog.till-westermayer.de/index

Photo of the week: Livorno, port area - XI
Ein letztes Foto von der Florenz-Reise, aber eben nicht aus Florenz, sondern aus Livorno. Die Hafenstadt liegt etwas siebzig Kilometer westlich von Florenz. Nachdem ich auf einer Karte gesehen hatte, dass das Mittelmeer gar nicht so weit entfernt ist, habe ich kurzentschlossen einen nachmittäglichen