Tootfinder

Massiver Cyberangriff auf US-Provider: Erster Einbruch schon ein Jahr früher
2024 ist mutmaßlich chinesischen Angreifern ein massiver Angriff auf US-Provider gelungen. Eine Malware wurde aber offenbar deutlich früher installiert.

This is so out of touch. ICE is ambushing and kidnapping our neighbors and we're going to "cover the entire city with drones"? The SFBOS should reject this "gift"
https://missionlocal.org/2025/06/were-

‘We’re going to be covering the entire city with drones’: Billionaire’s donation to SFPD accepted
San Francisco police commission accepts tech billionaire's gift, to provide cops with drones, cameras and a massive new office

game_thrones: Game of Thrones coappearances
Network of coappearances of characters in the Game of Thrones series, by George R. R. Martin, and in particular coappearances in the book "A Storm of Swords." Nodes are unique characters, and edges are weighted by the number of times the two characters' names appeared within 15 words of each other in the text.
This network has 107 nodes and 352 edges.
Tags: Social, Fictional, Weighted

A lecture note on covering theory in representation theory of algebras
Pengyun Chen, Nengqun Li, Yuming Liu, Bohan Xing
https://arxiv.org/abs/2508.01563 https://

A lecture note on covering theory in representation theory of algebras
Covering theory is an important tool in representation theory of algebras, however, the results and the proofs are scattered in the literature. We give an introduction to covering theory at a level as elementary as possible.

🇺🇦 #NowPlaying on KEXP's #VarietyMix
The Coup:
🎵 Fat Cats, Bigga Fish
#TheCoup
https://chopperman.bandcamp.com/track/the-coup-fat-cats-bigga-fish
https://open.spotify.com/track/74mjiDuK4B0yKtMBoVWt51

This https://arxiv.org/abs/2412.12633 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Arborescences of Random Covering Graphs
A rooted arborescence of a directed graph is a spanning tree directed towards a particular vertex. A recent work of Chepuri et al. showed that the arborescences of a covering graph of a directed graph G are closely related to the arborescences of G. In this paper, we study the weighted sum of arborescences of a random covering graph and give a formula for the expected value, resolving a conjecture of Chepuri et al.

Optimizing Mesh to Improve the Triangular Expansion Algorithm for Computing Visibility Regions
Jan Mikula (Czech Institute of Informatics, Robotics and Cybernetics, Czech Technical University in Prague, Department of Cybernetics, Faculty of Electrical Engineering, Czech Technical University in Prague), Miroslav Kulich (Czech Institute of Informatics, Robotics and Cybernetics, Czech Technical University in Prague)

Optimizing Mesh to Improve the Triangular Expansion Algorithm for Computing Visibility Regions
This paper addresses the problem of improving the query performance of the triangular expansion algorithm (TEA) for computing visibility regions by finding the most advantageous instance of the triangular mesh, the preprocessing structure. The TEA recursively traverses the mesh while keeping track of the visible region, the set of all points visible from a query point in a polygonal world. We show that the measured query time is approximately proportional to the number of triangle edge expansio…

lesmis: Les Misérables coappearances
The network of scene coappearances of characters in Victor Hugo's novel "Les Miserables". Edge weights denote the number of such occurrences.
This network has 77 nodes and 254 edges.
Tags: Social, Fictional, Weighted
https://networks.skewed.de/net/lesmis

Elektronische Patientenakte: Techniker Krankenkasse will Videoident zurück
Um Versicherten den Zugang zur elektronischen Patientenakte zu erleichtern, möchte die Techniker Krankenkasse das Videoident-Verfahren wieder zurückbringen.

Ein einfaches Passwort war alles, was zwischen Hackern und der Kontrolle über einen ganzen Staudamm stand! 😱 Der kürzlich bekannt gewordene Vorfall am norwegischen Risevatnet-Stausee ist ein alarmierendes Beispiel dafür, wie verwundbar unsere kritische Infrastruktur sein kann.
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