Tootfinder

🐛 Trees and hedges on farmland significantly boost butterfly numbers
#trees

Trees and hedges on farmland significantly boost butterfly numbers
University of Oxford researchers have led a new study which found that hedgerows, small copses and even individual trees can significantly increase the number of butterflies in farmed landscapes. The findings have been published in the journal Ecological Solutions and Evidence.

Alley Stories V 🔣
巷弄故事 V 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Back home from a bike and hike with a friend. I'm absolutely devastated.
Every muscle from my hips downward hurts. But I made it!
#nature #landscape #hiking

Alley Stories V 🔣
巷弄故事 V 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

Yiding Cao Geld mit PayPal.Me senden
Folgen Sie dem Link PayPal.Me/dingsterdingster und geben Sie den Betrag ein. Es ist bequem und sicher. Sie haben noch kein PayPal-Konto? Kein Problem.

🇺🇦 #NowPlaying on KEXP's #Early
Radiohead:
🎵 Fake Plastic Trees
#Radiohead
https://sergioam.bandcamp.com/track/radiohead-fake-plastic-trees-acoustic-guitar
https://open.spotify.com/track/73CKjW3vsUXRpy3NnX4H7F

If you have arrived in Norrköping for #ic2s2 and wonder if you should jump into the Glan then yes you absolutely should. Weather & water are fantastic!

Erosion studies from our morning hike yesterday, a ~500m long section of the valley exposing interesting structures and the fragility of life resting on the thin layer of top soil...
#Geology #Erosion #NaturePhotography

"Amazon deforestation spikes as Brazil blames criminal fires"
#AmazonRainforest #Trees #Environment

Amazon deforestation spikes as Brazil blames criminal fires
A new and alarming pattern of destruction is emerging in the rainforest, challenging Brazilian authorities ahead of COP30.

i was put in charge of three grandchildren for a few hours yesterday so we headed straight to ben & jerry's to split a milkshake, then explored the state theater (and even sneaked into a movie but later got thrown out for horsing around on the escalator), then i gave a nickel tour of angell/mason/haven halls, then they chased squirrels on the diag which took longer than you might think, then we looked in all the windows in nickels arcade. it all went slowly and well.

Uff finally I wrote the blogpost for a hike I did in May (and you've probably seen the video of it already). But I haven't shared the #photos ans some more background story from it.
I don't know why but this time I found it really hard to write. Maybe I'm a bit out of practice or I just didn't find the right mood for it - I'm not sure.
Anyways, I hope you enjoy…

Street trees unequally distributed across Canada, study finds #Canada

Street trees unequally distributed across Canada, study finds
A new study from the University of Toronto Mississauga finds that street trees are unevenly distributed across Canadian cities, with marginalized neighborhoods often seeing fewer and smaller trees and less species diversity.

🇺🇦 #NowPlaying on BBCRadio3's #Unclassified
Held by Trees:
🎵 Boughs and Branches
#HeldbyTrees
https://open.spotify.com/track/4akWHeyxKe7sjQgn0dduJz
Please 🔁 BOOST to share what you like
- your followers don't see if you ⭐ favourite a post

Lily Cheng, NIMBY councillor of #Willowdale in Toronto went to South Korea.
What did she learn? She learned about sleek parking infrastructure. In South Korea! Speak about missing the forest for the trees
Also Toronto transit isn't randomly underdevelopped, it's something she can actually influence as a councillor. She's saying that as if it just happened and th…

The sounds of chainsaws had replaced the sound of leaf blowers on my walk today. Saw a lot of big branches down and two trees, including one that looked like it split in half.

We hoofed it up Mill Mountain before the heat ~really~ set in. The humidity did not wait, unfortunately, but we enjoyed it all the same.
We are now decamped in a coffee shop and pondering lunch options. I think we’re off to a bistro and bakery we’ve heard great things about. Their Better Than Sex cake is reputed to be true to its name.

🇺🇦 Auf radioeins läuft...
Neil Young, neil young and the chrome hearts:
🎵 Talkin to the Trees
#NowPlaying #NeilYoung #neilyoungandthechromehearts
https://open.spotify.com/track/6OwAcjV6LxKFI3BYQxkidp

The proposed sell-off of federal lands in the Senate budget bill includes a LOT of Joshua tree habitat—the trees grow in some of the largest areas of undeveloped land in the lower 48 states
The place where eastern and western Joshua trees hybridize, north of Creech AFB, is included
#JoshuaTree #USpolitics

from my link log —
Tools built on tree-sitter's concrete syntax trees.
https://www.scannedinavian.com/tools-built-on-tree-sitters-concrete-syntax-trees.html
saved 2025-06-01

Visited my 95-year-old Mom in Saskatchewan and came away with Prairie pictures and thoughts on memory and topography and Google color science and healthcare economics. https://www.tbray.org/ongoing/When/202x/2025/07/09/Saskatchewan

Memory in Saskatchewan

Replaced article(s) found for cs.AI. https://arxiv.org/list/cs.AI/new
[4/5]:
- UD-English-CHILDES: A Collected Resource of Gold and Silver Universal Dependencies Trees for Chil...
Xiulin Yang, Zhuoxuan Ju, Lanni Bu, Zoey Liu, Nathan Schneider

Tree-SLAM: semantic object SLAM for efficient mapping of individual trees in orchards
David Rapado-Rincon, Gert Kootstra
https://arxiv.org/abs/2507.12093 h…

Tree-SLAM: semantic object SLAM for efficient mapping of individual trees in orchards
Accurate mapping of individual trees is an important component for precision agriculture in orchards, as it allows autonomous robots to perform tasks like targeted operations or individual tree monitoring. However, creating these maps is challenging because GPS signals are often unreliable under dense tree canopies. Furthermore, standard Simultaneous Localization and Mapping (SLAM) approaches struggle in orchards because the repetitive appearance of trees can confuse the system, leading to mapp…

Distinguishing finite and infinite trees of arbitrary cardinality
Wilfried Imrich, Rafa{\l} Kalinowski, Florian Lehner, Monika Pl\'sniak, Marcin Stawiski
https://arxiv.org/abs/2506.14402

Distinguishing finite and infinite trees of arbitrary cardinality
Let $G$ be a finite or infinite graph and $m(G)$ the minimum number of vertices moved by the non-identity automorphisms of $G$. We are interested in bounds on the supremum $Δ(G)$ of the degrees of the vertices of $G$ that assure the existence of vertex colorings of $G$ with two colors that are preserved only by the identity automorphism, and, in particular, in the number $a(G)$ of such colorings that are mutually inequivalent. For trees $T$ with finite $m(T)$ we obtain the bound $Δ(T)\leq2^…

🌰 Offsetting fossil fuel reserves by planting trees is not a viable strategy, analysis finds
https://phys.org/news/2025-06-offsetting-fossil-fuel-reserves-trees.html

Offsetting fossil fuel reserves by planting trees is not a viable strategy, analysis finds
New forests larger than the land area of North America would need to be planted to offset the potential carbon dioxide emissions from the fossil fuel reserves currently held by the world's 200 largest fossil fuel companies.

Compressing Suffix Trees by Path Decompositions
Ruben Becker, Davide Cenzato, Travis Gagie, Sung-Hwan Kim, Ragnar Groot Koerkamp, Giovanni Manzini, Nicola Prezza
https://arxiv.org/abs/2506.14734

Compressing Suffix Trees by Path Decompositions
In classic suffix trees, path compression works by replacing unary suffix trie paths with pairs of pointers to $T$, which must be available in the form of some random access oracle at query time. In this paper, we revisit path compression and show that a more careful choice of pointers leads to a new elegant, simple, and remarkably efficient way to compress the suffix tree. We begin by observing that an alternative way to path-compress the suffix trie of $T$ is to decompose it into a set of (di…

Sunrise this morning.

Exactly one hundred sixty days apart.
(This past Friday vs. early Feb, Raintal)
#SilentSunday #LandscapePhotography #Phtography

Our new art handler, Doug Hollingsworth, is a real renaissance man. He's played in bands, written several novels and worked at both the Guggenheim and the Museum of Modern Art in New York. Learn more about Doug in our latest blog post: https://georgiamuseum.org/gmoa_blog/do

Princess Meownonoke
🎨by Yagyou

CAUTION Echoes of the past can be heard here #SignpostSaturday #RievaulxAbbey #NorthYorkshire

Fast Learning of Optimal Policy Trees
James Cussens, Julia Hatamyar, Vishalie Shah, Noemi Kreif
https://arxiv.org/abs/2506.15435 https://

Fast Learning of Optimal Policy Trees
We develop and implement a version of the popular "policytree" method (Athey and Wager, 2021) using discrete optimisation techniques. We test the performance of our algorithm in finite samples and find an improvement in the runtime of optimal policy tree learning by a factor of nearly 50 compared to the original version. We provide an R package, "fastpolicytree", for public use.

Emulating Dark Matter Halo Merger Trees with Graph Generative Models
Tri Nguyen, Chirag Modi, Siddharth Mishra-Sharma, L. Y. Aaron Yung, Rachel S. Somerville
https://arxiv.org/abs/2507.10652

Emulating Dark Matter Halo Merger Trees with Graph Generative Models
Merger trees track the hierarchical assembly of dark matter halos across cosmic time and serve as essential inputs for semi-analytic models of galaxy formation. However, conventional methods for constructing merger trees rely on ad-hoc assumptions and are unable to incorporate environmental information. Nguyen et al. (2024) introduced FLORAH, a generative model based on recurrent neural networks and normalizing flows, for modeling main progenitor branches of merger trees. In this work, we exten…

StylOch at PAN: Gradient-Boosted Trees with Frequency-Based Stylometric Features
Jeremi K. Ochab, Mateusz Matias, Tymoteusz Boba, Tomasz Walkowiak
https://arxiv.org/abs/2507.12064

StylOch at PAN: Gradient-Boosted Trees with Frequency-Based Stylometric Features
This submission to the binary AI detection task is based on a modular stylometric pipeline, where: public spaCy models are used for text preprocessing (including tokenisation, named entity recognition, dependency parsing, part-of-speech tagging, and morphology annotation) and extracting several thousand features (frequencies of n-grams of the above linguistic annotations); light-gradient boosting machines are used as the classifier. We collect a large corpus of more than 500 000 machine-generat…

Another tree planted this year that no one watered so it died. I don’t know why it isn’t a bigger scandal Public Works let dozens of street trees die through inaction after their contractor went bankrupt. Only one Chron article mentioned it and only from the angle of “nonprofit shuts down.”

Today's stream is all about bringing a bonsai drip pot to life! We're 3D printing an oval drip pot for those tiny trees. Hopefully, it's more Zen than Z-wobble! Tune in! #3DPrinting #Bonsai #LiveStream

"By Turning Themselves to Stone, These Remarkable Fig Trees Sequester CO2 Far Longer Than Normal"
#Trees #Environment #CarbonDioxide

By Turning Themselves to Stone, These Remarkable Fig Trees Sequester CO2 Far Longer Than Normal
The inorganic carbon in calcium carbonate typically has a much longer lifetime in the soil than organic carbon

THE NEW ALBUM 'TALKIN TO THE TREES' BY NEIL YOUNG AND THE CHROME HEARTS IS OUT NOW!

OS-Harm: A Benchmark for Measuring Safety of Computer Use Agents
Thomas Kuntz, Agatha Duzan, Hao Zhao, Francesco Croce, Zico Kolter, Nicolas Flammarion, Maksym Andriushchenko
https://arxiv.org/abs/2506.14866

OS-Harm: A Benchmark for Measuring Safety of Computer Use Agents
Computer use agents are LLM-based agents that can directly interact with a graphical user interface, by processing screenshots or accessibility trees. While these systems are gaining popularity, their safety has been largely overlooked, despite the fact that evaluating and understanding their potential for harmful behavior is essential for widespread adoption. To address this gap, we introduce OS-Harm, a new benchmark for measuring safety of computer use agents. OS-Harm is built on top of the O…

#silentSunday #RockyMountainNationalPark
View from Many Parks Curve. October 2016

Replaced article(s) found for stat.ML. https://arxiv.org/list/stat.ML/new
[1/1]:
Generalized Random Forests using Fixed-Point Trees
https://…

Recursive Variational Autoencoders for 3D Blood Vessel Generative Modeling
Paula Feldman, Miguel Fainstein, Viviana Siless, Claudio Delrieux, Emmanuel Iarussi
https://arxiv.org/abs/2506.14914

Recursive Variational Autoencoders for 3D Blood Vessel Generative Modeling
Anatomical trees play an important role in clinical diagnosis and treatment planning. Yet, accurately representing these structures poses significant challenges owing to their intricate and varied topology and geometry. Most existing methods to synthesize vasculature are rule based, and despite providing some degree of control and variation in the structures produced, they fail to capture the diversity and complexity of actual anatomical data. We developed a Recursive variational Neural Network…

Coolest part of this: it somehow escaped Dutch Elm Disease and they are gathering its seeds to propagate what *may* be naturally resistant genetics. https://flipboard.com/@cbcnews/top-stories-01r3k2ttz/-/a-CoiPb3nXRaK1lwOlyr7ZwA:a%3…

One of Toronto's oldest elm trees is on its last legs. Researchers are racing to re-grow copies
One of the largest old elm trees in Toronto — possibly in all of southern Ontario — is on its last legs. But as the city finalizes plans to take down …

A new paper projecting Joshua tree habitat under future climate based on incredibly high-resolution distribution data, from Joshua Tree Genome Project collaborators at USGS. They estimate up to 80% loss of suitable habitat by 2100 under the worst-case climate scenario.
#JoshuaTree #science

Isometric-Universal Graphs for Trees
Edgar Baucher, Fran\c{c}ois Dross, Cyril Gavoille
https://arxiv.org/abs/2506.11704 https://arxiv…

Isometric-Universal Graphs for Trees
We consider the problem of finding the smallest graph that contains two input trees each with at most $n$ vertices preserving their distances. In other words, we look for an isometric-universal graph with the minimum number of vertices for two given trees. We prove that this problem can be solved in time $O(n^{5/2}\log{n})$. We extend this result to forests instead of trees, and propose an algorithm with running time $O(n^{7/2}\log{n})$. As a key ingredient, we show that a smallest isometric-un…

Deciding Sparseness of Regular Languages of Finite Trees and Infinite Words
Kord Eickmeyer, Georg Schindling
https://arxiv.org/abs/2507.03465 https://

Deciding Sparseness of Regular Languages of Finite Trees and Infinite Words
We study the notion of sparseness for regular languages over finite trees and infinite words. A language of trees is called sparse if the relative number of $n$-node trees in the language tends to zero, and a language of infinite words is called sparse if it has measure zero in the Bernoulli probability space. We show that sparseness is decidable for regular tree languages and for regular languages of infinite words. For trees, we provide characterisations in terms of forbidden subtrees and tre…

Urban Living V - Iconography 🎎
都市生活 V - 图解 🎎
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Holy cow, only 24 hrs after putting it out in the yard, the silvereyes ('tauhou' in te reo Māori, which means 'new arrivals' as they've migrated here to Aotearoa without human assistance) have already found the new sugar water feeder! I'm delighted 🤩🤗 Will try to get some better pictures.

Me (to myself): Get in to work early this morning, with no messing about on the way in. Just 'a to b', fast and efficient!
Also me: [Leaves very late, grabs a unicycle and proceeds to cycling in via the following route]
🤷
https://www.strava.com/activities/14824892

Implied Probabilities and Volatility in Credit Risk: A Merton-Based Approach with Binomial Trees
Jagdish Gnawali, Abootaleb Shirvani, Svetlozar T. Rachev
https://arxiv.org/abs/2506.12694

Implied Probabilities and Volatility in Credit Risk: A Merton-Based Approach with Binomial Trees
We explore credit risk pricing by modeling equity as a call option and debt as the difference between the firm's asset value and a put option, following the structural framework of the Merton model. Our approach proceeds in two stages: first, we calibrate the asset volatility using the Black-Scholes-Merton (BSM) formula; second, we recover implied mean return and probability surfaces under the physical measure. To achieve this, we construct a recombining binomial tree under the real-world (natu…

Splitting a graph by a given partition of the set of vertices based on the minimum weight of the induced trees
V. A. Buslov
https://arxiv.org/abs/2507.11909

Splitting a graph by a given partition of the set of vertices based on the minimum weight of the induced trees
A method for considering a weighted directed graph with an accuracy of up to a given partition of the set of vertices is proposed. The resulting digraph (the splitting graph) does not contain arcs inside each partition element, and the arcs between the partition atoms are calculated in a special way taking into account the arcs of the original directed graph inside the atoms. This accounting is based on minimal trees defined on atoms. A study was made of what information about the original digr…

Order-Dependent Dissimilarity Measures on Phylogenetic Trees
Simone Linz, Katherine St. John, Charles Semple, Kristina Wicke
https://arxiv.org/abs/2507.11254

Order-Dependent Dissimilarity Measures on Phylogenetic Trees
Ordered leaf attachment, Phylo2Vec, and HOP are three recently introduced vector representations for rooted phylogenetic trees where the representation is determined by an ordering of the underlying leaf set X. Comparing the vectors of two rooted phylogenetic X-trees T and T' for a fixed ordering on X leads to polynomial-time computable measure for the dissimilarity of T and T', albeit dependent on the choice of the leaf ordering. For each of ordered leaf attachment, Phylo2Vec, and HOP, we comp…

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[1/3]:
Improved Quantum Query Upper Bounds Based on Classical Decision Trees

From this morning’s walk

Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

Cities are fighting rising temperatures with tree-planting initiatives to combat urban heat islands and improve air quality. A practical and effective climate solution. #climatechange #climatesolutions #climate

Officials launch ambitious 5-year plan to fight dangerous impacts of soaring temperatures: 'A great strategy'
College Station is launching a 5-year plan to fight urban heat — and it's all about planting more trees.

Quick snap from a smaller #cycling loop today. Now relaxing and recovering for the mountain tomorrow.
#benediktbeuern #KochelAmSee

Urban Living III - Secrecy 🙊
都市生活 III - 秘密 🙊
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Oldies but Goldies: The Potential of Character N-grams for Romanian Texts
Dana Lupsa, Sanda-Maria Avram
https://arxiv.org/abs/2506.15650 https://

Oldies but Goldies: The Potential of Character N-grams for Romanian Texts
This study addresses the problem of authorship attribution for Romanian texts using the ROST corpus, a standard benchmark in the field. We systematically evaluate six machine learning techniques: Support Vector Machine (SVM), Logistic Regression (LR), k-Nearest Neighbors (k-NN), Decision Trees (DT), Random Forests (RF), and Artificial Neural Networks (ANN), employing character n-gram features for classification. Among these, the ANN model achieved the highest performance, including perfect clas…

glass: ordered set data structure for client-side order books
Viktor Krapivensky
https://arxiv.org/abs/2506.13991 https://arxiv.org/p…

glass: ordered set data structure for client-side order books
The "ordered set" abstract data type with operations "insert", "erase", "find", "min", "max", "next" and "prev" is ubiquitous in computer science. It is usually implemented with red-black trees, $B$-trees, or $B^+$-trees. We present our implementation of ordered set based on a trie. It only supports integer keys (as opposed to keys of any strict weakly ordered type) and is optimized for market data, namely for what we call sequential locality. The following is the list of what we believe to be …

#SilentSunday

cAST: Enhancing Code Retrieval-Augmented Generation with Structural Chunking via Abstract Syntax Tree
Yilin Zhang, Xinran Zhao, Zora Zhiruo Wang, Chenyang Yang, Jiayi Wei, Tongshuang Wu
https://arxiv.org/abs/2506.15655

cAST: Enhancing Code Retrieval-Augmented Generation with Structural Chunking via Abstract Syntax Tree
Retrieval-Augmented Generation (RAG) has become essential for large-scale code generation, grounding predictions in external code corpora to improve actuality. However, a critical yet underexplored aspect of RAG pipelines is chunking -- the process of dividing documents into retrievable units. Existing line-based chunking heuristics often break semantic structures, splitting functions or merging unrelated code, which can degrade generation quality. We propose chunking via Abstract Syntax Trees …

A quick #selfie and a photo taken on the bike from #cycling near the #chiemsee today.
It was about 30°C but the wind made it really comfortable (and that we applied quite some sun cream).
Ch…

"‘New hope’: ash trees rapidly evolving resistance to dieback, study reveals"
#UK #UnitedKingdom #Trees

Vector Representations of Vessel Trees
James Batten, Michiel Schaap, Matthew Sinclair, Ying Bai, Ben Glocker
https://arxiv.org/abs/2506.11163 https://

Vector Representations of Vessel Trees
We introduce a novel framework for learning vector representations of tree-structured geometric data focusing on 3D vascular networks. Our approach employs two sequentially trained Transformer-based autoencoders. In the first stage, the Vessel Autoencoder captures continuous geometric details of individual vessel segments by learning embeddings from sampled points along each curve. In the second stage, the Vessel Tree Autoencoder encodes the topology of the vascular network as a single vector r…

Life on Different Paths III🚶🚶‍♀️🚶‍♂️
生活诸多路径 III🚶🚶‍♀️🚶‍♂️
📷 Nikon FE
🎞️FOMAPAN Action 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

AST-Enhanced or AST-Overloaded? The Surprising Impact of Hybrid Graph Representations on Code Clone Detection
Zixian Zhang, Takfarinas Saber
https://arxiv.org/abs/2506.14470

AST-Enhanced or AST-Overloaded? The Surprising Impact of Hybrid Graph Representations on Code Clone Detection
As one of the most detrimental code smells, code clones significantly increase software maintenance costs and heighten vulnerability risks, making their detection a critical challenge in software engineering. Abstract Syntax Trees (ASTs) dominate deep learning-based code clone detection due to their precise syntactic structure representation, but they inherently lack semantic depth. Recent studies address this by enriching AST-based representations with semantic graphs, such as Control Flow Gra…

This grassy field has always been a beautiful buffer between the river and the train tracks that service the local waste management company that owns it. This time of year, wildflowers and butterflies are everywhere and it’s one of the highlights on this part of the greenway.
This week, I’ve noticed it’s suddenly begun to accumulate vintage fire and rescue vehicles. I don’t know what to make of it, but I hope it’s temporary.

here’s what look to be newish sidewalk trees, 2 of them, on Capp in front of Alioto Park.
I have mixed feelings. Capp’s sidewalks are a miserly 9’ while the roadway is much too wide. Now when SF widens the sidewalk, these trees will be obstructions in the middle of it. We need to legalize planting trees in the parking lane

Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

It's a running gag that my wife is like Columbo's wife on 𝐶𝑜𝑙𝑢𝑚𝑏𝑜 [1] because she's always getting mentioned on my socials but she never shows up.. here she is, in the garden she maintains in front of the barn
#photo #photography

An early morning alone on the banks of the (still young) Isar river some weeks ago... Really more "flow" rather than #WaterfallWednesday, but I just absolutely cherish places and moments like this & feeling so privileged being able to experience these after decades of living in large cities... (each time also a reminder how much we stand to lose...)

Splittable Spanning Trees and Balanced Forests in Dense Random Graphs
David Gillman, Jacob Platnick, Dana Randall
https://arxiv.org/abs/2507.12707 https://…

Splittable Spanning Trees and Balanced Forests in Dense Random Graphs
Weighted equitable partitioning of a graph has been of interest lately due to several applications, including redistricting, network algorithms, and image decomposition. Weighting a partition according to the spanning-tree metric has been of mathematical and practical interest because it typically favors partitions with more compact pieces. An appealing algorithm suggested by Charikar et al. is to sample a random spanning tree and remove k-1 edges, producing a random forest. If the components o…

Good morning everyone! We are starting into our second week of vacation. We'll be seeing some friends.
Meanwhile, enjoy this photo from a bike and hike we did last year.
#hiking #wandern #mountains

"City Lights Extend Growing Season for Urban Trees"
#Trees #LightPollution
https://e360…

City Lights Extend Growing Season for Urban Trees

Cocompact unfolding trees
Roman Gorazd
https://arxiv.org/abs/2507.07503 https://arxiv.org/pdf/2507.07503

Cocompact unfolding trees
This paper will show when a rooted path tree of a finite directed rooted graph has only finitely many orbits under the action of its undirected automorphism group (i.e. when it is cocompact). This will allow us to specify which trees are almost isomorphic to cocompact trees. We will provide an algorithm that will determine this, thus mostly answering question (1) from arXiv:2212.07205.

Alley Stories II 🔣
巷弄故事 II 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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We showed up just in time to see these Confederate soldiers fire a cannon at Gettysburg National Military Park last Saturday
#photo #photography #pennsylvania

Interesting study of eastern Joshua tree mycorrhizal associations from trees near the Dome Fire burn in Mojave National Preserve, with sampling stratified by season
#ecology #mutualism #JoshuaTree …

Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

Alley Stories II 🔣
巷弄故事 II 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

Yiding Cao Geld mit PayPal.Me senden
Folgen Sie dem Link PayPal.Me/dingsterdingster und geben Sie den Betrag ein. Es ist bequem und sicher. Sie haben noch kein PayPal-Konto? Kein Problem.

Degree Sequence of Albertson and $\sigma$-Indices on Trees of Order $n\geqslant 3$
Jasem Hamoud, Artem Kornosov
https://arxiv.org/abs/2506.08213 https://…

Degree Sequence of Albertson and $σ$-Indices on Trees of Order $n\geqslant 3$
In this paper, we presented a study of topological indices on trees, where we show a relationship with irregularity of Albertson index and minimum, maximum degrees $δ,Δ$ of graph $G$, where contribute vital roles in determining connection, shading, component incorporation, and realisability where well-known Albertson index as: $\operatorname{irr}(G)=\sum_{uv\in E(G)}\lvert d_u(G)-d_v(G) \rvert$. The sigma index on trees that we introduced as $σ(T)=(d_1-1)^3+\sum_{i=1}^{3}(d_i-1)(d_i-2)+(d_3-…

Just a quick snap from today's bike and hike.
I'm a bit done now. Photos and video will come later.
#photography #naturephotography #landscapephotography

"Colombia cuts deforestation by one-third as government targets Amazon and illegal mining"
#Colombia #Trees #Deforestation

Colombia cuts deforestation by one-third as government targets Amazon and illegal mining
Colombia’s environment ministry reported a 33% drop in deforestation during the first quarter of 2025, citing coordinated enforcement efforts and strengthened partnerships with local communities.Steven Grattan reports for The Associated Press.In short:Colombia’s deforestation fell from 40,219 hectar...

Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

Weird Greco II 🇬🇷
怪异希腊 II 🇬🇷
📷 Nikon FE
🎞️FOMAPAN Action 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

This https://arxiv.org/abs/2412.16505 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Spectral conditions for spanning $k$-trees or $k$-ended-trees of $t$-connected graphs
Let $G$ be a connected graph of order $n$. A spanning $k$-tree of $G$ is a spanning tree with the maximum degree at most $k$, and a spanning $k$-ended-tree of $G$ is a spanning tree at most $k$ leaves, where $k\geq2$ is an integer. This paper establishes some spectral conditions for the existence of spanning $k$-trees or spanning $k$-ended-trees in $t$-connected graphs, which generalize the results of Fan et al. (2022) and Zhou (2010), and improve the results of Fiedler et al. (2010), Ao et al.…

🪁 Non-native trees gain ground in eastern US, reducing native species diversity
(... blame Ben Franklin!)
https://phys.org/news/2025-04-native-trees-gain-ground-eastern.html

Non-native trees gain ground in eastern US, reducing native species diversity
In the largest study of its kind, researchers at the Florida Museum of Natural History have used data from a 120-year-old program managed by the U.S. Department of Agriculture to quantify the effects of introduced species.

Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

"Ancient trees are shipped to the UK, then burned – using billions in ‘green’ subsidies. Stop this madness now - Dale Vince"
#UK #UnitedKingdom #Trees

#FotoVorschlag " Dinge, die mit L beginnen " (Things starting with L)
I screened quite some photos because I didn't want to choose "Landscape" - But then I found this photo of the #Lynx that I took at the

Connected forcing density and related problems
Boris Brimkov, Randy Davila, Houston Schuerger
https://arxiv.org/abs/2507.11194 https://

Connected forcing density and related problems
A connected forcing set of a graph is a zero forcing set that induces a connected subgraph. In this paper, we introduce and study CF-dense graphs -- graphs in which every vertex belongs to some minimum connected forcing set. We identify several CF-dense graph families and investigate the relationships between CF-density and analogous notions in zero forcing and total forcing. We also characterize CF-dense trees and give a formula for the number of distinct connected forcing sets in trees. Final…

Urban Living 🌝
都市生活 🌝
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Good morning from Harlem
#Photography #GoodMorning #Sunrise #NYC

"‘Win-win’: new maps reveal best opportunities for global reforestation"
#Environment #Reforestation

Natura Urbana X - Perspectives 🏵️
城市自然 X - 角度 🏵️
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1995
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Back from a #cycling loop around the #ammersee !
Unfortunately I forgot to turn on my cycling computer for the first half hour 🥴 Yeah well, the red frame around the statistics page was quite clear but .. well.
Anyways! It was a nice ~50km loop with excellent weather (prepared with a lo…

"Young secondary forests may be the planet’s most overlooked carbon sink"
#Trees #Environment

Young secondary forests may be the planet’s most overlooked carbon sink
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. As governments and corporations scramble to meet climate pledges, the search for reliable and scalable carbon removal strategies has turned increasingly toward forests. But while tree planting captures the public imagination, a new study suggests a simpler, less […]

Urban Composition V 🫟
都市构图 V 🫟
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1995
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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While I'm copying yesterday's photos to my computer, I'll just share some more photos from my recent blog post.
I tried to put the bushes at the lake as framing elements into the #photos. I think it worked out quite okay. -- And while we were on this walk I imagined all the time where and how this could look at sunset or with fog.
Maybe I should go there a again a couple o…

Urban Living II 🌝
都市生活 II 🌝
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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Urban Solitude V 🈳
城市孤独 V 🈳
📷 Pentax MX
🎞️Fujifilm Neopan SS, expired 1995
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

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