Tootfinder

Meine Güte, täglich immer wieder mehrere Infos über weltweite Cyberangriffe und einige sind sehr umfangreich komplex doch die meisten sind mMn einfach anhand der vernachlässigten IT-Sicherheit vorhersehbar. Ja es ist ein Aufwand um dem permanent gegenüber zu treten aber der ist einiges größer nach erfolgreichen Angriff. Nein Linux ist nicht per-se die Lösung aber deren Lücken werden sehr schnell geschlossen 🤨

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Cyberangriff | heise online

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

Wenn man wesentliche Infrastruktur ins öffentliche Internet hängt:
https://www.golem.de/news/cyberangriff-in-norwegen-hacker-reissen-ventile-eines-staudamms-ganz-auf-2507-197684.html

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.
Zum Artikel:

Covariant Lie Derivatives and (Super-)Gravity
Grigorios Giotopoulos
https://arxiv.org/abs/2507.00140 https://arxiv.org/pdf/2507.00140…

Covariant Lie Derivatives and (Super-)Gravity
The slightly subtle notion of covariant Lie derivatives of \textit{bundle-valued} differential forms is crucial in many applications in physics, notably in the computation of conserved currents in gauge theories, and yet the literature on the topic has remained fragmentary. This note provides a complete and concise mathematical account of covariant Lie derivatives on a spacetime (super-)manifold $M,$ defined via choices of lifts of spacetime vector fields to principal $G$-bundles over it, or eq…

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 …

Numerical Techniques for the Maximum Likelihood Toeplitz Covariance Matrix Estimation: Part I. Symmetric Toeplitz Matrices
Yuri Abramovich, Victor Abramovich, Tanit Pongsiri
https://arxiv.org/abs/2507.01230

Numerical Techniques for the Maximum Likelihood Toeplitz Covariance Matrix Estimation: Part I. Symmetric Toeplitz Matrices
In several applications, one must estimate a real-valued (symmetric) Toeplitz covariance matrix, typically shifted by the conjugated diagonal matrices of phase progression and phase "calibration" errors. Unlike the Hermitian Toeplitz covariance matrices, these symmetric matrices have a unique potential capability of being estimated regardless of these beam-steering phase progression and/or phase "calibration" errors. This unique capability is the primary motivation of this paper.

Parsimonious Gaussian mixture models with piecewise-constant eigenvalue profiles
Tom Szwagier, Pierre-Alexandre Mattei, Charles Bouveyron, Xavier Pennec
https://arxiv.org/abs/2507.01542

Parsimonious Gaussian mixture models with piecewise-constant eigenvalue profiles
Gaussian mixture models (GMMs) are ubiquitous in statistical learning, particularly for unsupervised problems. While full GMMs suffer from the overparameterization of their covariance matrices in high-dimensional spaces, spherical GMMs (with isotropic covariance matrices) certainly lack flexibility to fit certain anisotropic distributions. Connecting these two extremes, we introduce a new family of parsimonious GMMs with piecewise-constant covariance eigenvalue profiles. These extend several lo…

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

Cybersicherheit im Gesundheitswesen erreicht eine neue, erschreckende Dimension: Der Angriff auf den britischen Pathologiedienstleister Synnovis hat nachweislich zum Tod eines Patienten geführt.
Zum Artikel: https://heise.de/-10463860?wt_mc=sm.re…