Tootfinder

Examples and Nonexamples of Distal Metric Structures
Aaron Anderson, Ita\"i Ben Yaacov
https://arxiv.org/abs/2508.09073 https://arxiv.org/pdf/2508.090…

Examples and Nonexamples of Distal Metric Structures
This article provides examples of distal metric structures. One source of examples are metric valued fields. By analyzing indiscernible sequences, we show that real closed metric valued fields are distal, and conclude that algebraically closed metric valued fields, while stable, have the strong Erdős-Hajnal property, which we define appropriately for metric structures. We find another example in topological dynamics: we study a metric structure whose automorphism group is the well-understood…

Why Artists Are Striking Spotify Over Daniel Ek’s AI-Offensive Weapons Bet—and Why It Matters for AI Deals http://musictechpolicy.com/2025/09/11/why-artists-are-striking-spotify-over-daniel-eks-ai-offe…

Why Artists Are Striking Spotify Over Daniel Ek’s AI-Offensive Weapons Bet—and Why It Matters for AI Deals
Over the summer, more artists began removing catalogs from Spotify—not just over bleak royalties but over CEO Daniel Ek’s investment in Helsing, a defense-tech firm building AI-enabled offensive we…

A Globally Optimal Analytic Solution for Semi-Nonnegative Matrix Factorization with Nonnegative or Mixed Inputs
Lu Chenggang
https://arxiv.org/abs/2508.07134 https://

A Globally Optimal Analytic Solution for Semi-Nonnegative Matrix Factorization with Nonnegative or Mixed Inputs
Semi-Nonnegative Matrix Factorization (semi-NMF) extends classical Nonnegative Matrix Factorization (NMF) by allowing the basis matrix to contain both positive and negative entries, making it suitable for decomposing data with mixed signs. However, most existing semi-NMF algorithms are iterative, non-convex, and prone to local minima. In this paper, we propose a novel method that yields a globally optimal solution to the semi-NMF problem under the Frobenius norm, through an orthogonal decomposi…

Governments freeloading on FOSS, not helping with funding (and at the same time collecting taxes on income/donations sourced otherwise) are just as exploitative as privately held companies, maybe even worse...
https://scalie.zone/@aks/115012388922867133

Cane Matters
Great Australian Pods Podcast Directory: #GreatAusPods

Exploiting repeated matrix block structures for more efficient CFD on modern supercomputers
Josep Plana-Riu, F. Xavier Trias, \`Adel Alsalti-Baldellou, Xavier \'Alvarez-Farr\'e, Guillem Colomer, Assensi Oliva
https://arxiv.org/abs/2508.06710

Exploiting repeated matrix block structures for more efficient CFD on modern supercomputers
Computational Fluid Dynamics (CFD) simulations are often constrained by the memory-bound nature of sparse matrix-vector operations, which eventually limits performance on modern high-performance computing (HPC) systems. This work introduces a novel approach to increase arithmetic intensity in CFD by leveraging repeated matrix block structures. The method transforms the conventional sparse matrix-vector product (SpMV) into a sparse matrix-matrix product (SpMM), enabling simultaneous processing o…

Alarm raised over 'high-severity' vulnerabilities in Matrix messaging protocol https://therecord.media/matrix-messaging-protocol-high-severity-vulnerabilities

Mother Jones gets this right. https://www.motherjones.com/politics/2025/09/charlie-kirk-legacy-ezra-klein-2020-election-trump-turning-point/
«Kirk’s advocacy of vigorous debate ought not be separated from wh…

No, Charlie Kirk was not practicing politics the right way
His assassination deserves full condemnation; his full impact should not be sidestepped.

Instance-Optimal Matrix Multiplicative Weight Update and Its Quantum Applications
Weiyuan Gong, Tongyang Li, Xinzhao Wang, Zhiyu Zhang
https://arxiv.org/abs/2509.08911 https://

Instance-Optimal Matrix Multiplicative Weight Update and Its Quantum Applications
The Matrix Multiplicative Weight Update (MMWU) is a seminal online learning algorithm with numerous applications. Applied to the matrix version of the Learning from Expert Advice (LEA) problem on the $d$-dimensional spectraplex, it is well known that MMWU achieves the minimax-optimal regret bound of $O(\sqrt{T\log d})$, where $T$ is the time horizon. In this paper, we present an improved algorithm achieving the instance-optimal regret bound of $O(\sqrt{T\cdot S(X||d^{-1}I_d)})$, where…

Pardoned Insurrectionists Are Using Charlie Kirk’s Death to Call for Civil War – Mother Jones https://www.motherjones.com/politics/2025/09/pardoned-insurrectionists-are-using-charlie-kirks-death-to-call-for-civi…

Pardoned insurrectionists are using Charlie Kirk’s death to call for civil war
“Charlie Kirk's assassination pulled me out of retirement. More work must be done.”