Tootfinder

Mike Huckabee, the US ambassador to Israel, still earns profits from Substack subscriptions despite ceding editorial control of the Huckabee Post to his son (Dave Levinthal/Columbia Journalism Review)
https://www.cjr.org/news/huckabee-substack

Ferrexpo's Ukrainian mining subsidiary executive charged with $41 million tax evasion scheme: https://benborges.xyz/2025/07/18/ferrexpos-ukrainian-mining-subsidiary-executive.html

The spectral Tur\'{a}n problem: Characterizing spectral-consistent graphs
Longfei Fang, Huiqiu Lin, Mingqing Zhai
https://arxiv.org/abs/2508.12070 https://

The spectral Turán problem: Characterizing spectral-consistent graphs
Let ${\rm EX}(n,H)$ and ${\rm SPEX}(n,H)$ denote the families of $n$-vertex $H$-free graphs with the maximum size and the maximum spectral radius, respectively. A graph $H$ is said to be spectral-consistent if ${\rm SPEX}(n,H)\subseteq {\rm EX}(n,H)$ for sufficiently large $n$. A fundamental problem in spectral extremal graph theory is to determine which graphs are spectral-consistent. Cioabă, Desai and Tait [European J. Combin. 99 (2022) 103420] proposed the following conjecture: Let $H$ be…

Substack raised $100M from the Chernin Group, a16z, and others, sources say at a $1.1B valuation, as it builds a social network and focuses on advertising (New York Times)
https://www.nytimes.com/2025/07/17/business/substack-fundraising-social-network.htm…

Substack Raises $100 Million, Betting on Subscriptions but Coming Around to Ads
Substack, originally a newsletter service, says its app now has millions of users interacting with its creators.

Generalize across Homophily and Heterophily: Hybrid Spectral Graph Pre-Training and Prompt Tuning
Haitong Luo, Suhang Wang, Weiyao Zhang, Ruiqi Meng, Xuying Meng, Yujun Zhang
https://arxiv.org/abs/2508.11328

Generalize across Homophily and Heterophily: Hybrid Spectral Graph Pre-Training and Prompt Tuning
Graph ``pre-training and prompt-tuning'' aligns downstream tasks with pre-trained objectives to enable efficient knowledge transfer under limited supervision. However, existing methods rely on homophily-based low-frequency knowledge, failing to handle diverse spectral distributions in real-world graphs with varying homophily. Our theoretical analysis reveals a spectral specificity principle: optimal knowledge transfer requires alignment between pre-trained spectral filters and the intrinsic spe…

Very nice article about LLM architecture, a bit too complicated for me but probably not for others..
https://magazine.sebastianraschka.com/p/the-big-llm-architecture-comparison

The Big LLM Architecture Comparison
From DeepSeek-V3 to Kimi K2: A Look At Modern LLM Architecture Design

The best people https://spacetimetech.wordpress.com/2025/08/19/the-best-people

The best people
The sweetest, best people in the world don’t even think they are. They often have mental illnesses that they’re coping with. They often think awful things about themselves. But theyR…

The Spectator, which launched a US print edition in 2019, plans to double its print output in the US to 24 issues annually as part of a relaunch this fall (Sara Fischer/Axios)
https://www.axios.com/2025/08/19/the-spectator-us-edition-print

The Spectator to double print for U.S. edition
It's part of an industrywide print revival in the U.S. as publishers look for more ways to upsell jaded digital advertisers in the AI era.

Sources: Substack is pitching investors on a round between $50M and $100M that would value it above its ~$700M last round price, and is generating ~$45M in ARR (Eric Newcomer/Newcomer)
https://www.newcomer.co/p/scoop-substack-in-talks-to-raise

SCOOP: Substack in Talks to Raise Financing as It Taps Into the Zeitgeist of Trump II
Substack is generating about $45 million in annual recurring revenue: sources

Posets for Specht ideals of essential real reflection groups
Sebastian Debus, Kurt Klement Gottwald
https://arxiv.org/abs/2506.15335 https://

Posets for Specht ideals of essential real reflection groups
Specht ideals are symmetric ideals in the polynomial ring generated by Specht polynomials associated with group representations. These ideals were previously studied for reflection groups of types $A$ and $B$, where their inclusion relations and their varieties reflect rich combinatorial structures. In this paper, we extend this theory to type $D$ and the dihedral groups. Our results complete the combinatorial study of Specht ideals across all infinite families of essential real reflection grou…