Tootfinder

contiguous_usa: Contiguous states (USA)
A network of contiguous states in the USA, in which each state is a node and two nodes are connected if they share a land-based geographic border. The dataset includes the lower 48 states, and the District of Columbia.
This network has 49 nodes and 107 edges.
Tags: Transportation, Roads, Unweighted

"Capital has been here before with chintz—by which I mean real chintz, an artisanal craft from India. “Chintz” is originally a Hindi word, and if you’re like most people, you’ve probably got the term all wrong."
Informative, sweet, a great read. Re #aislop #ai

Hard Contacts with Soft Gradients: Refining Differentiable Simulators for Learning and Control
Anselm Paulus, A. Ren\'e Geist, Pierre Schumacher, V\'it Musil, Georg Martius
https://arxiv.org/abs/2506.14186

Hard Contacts with Soft Gradients: Refining Differentiable Simulators for Learning and Control
Contact forces pose a major challenge for gradient-based optimization of robot dynamics as they introduce jumps in the system's velocities. Penalty-based simulators, such as MuJoCo, simplify gradient computation by softening the contact forces. However, realistically simulating hard contacts requires very stiff contact settings, which leads to incorrect gradients when using automatic differentiation. On the other hand, using non-stiff settings strongly increases the sim-to-real gap. We analyze …

Bordered contact invariants and half Giroux torsion
Hyunki Min, Konstantinos Varvarezos
https://arxiv.org/abs/2506.14050 https://arxi…

Bordered contact invariants and half Giroux torsion
We show that there exist infinitely many closed contact 3-manifolds containing half Giroux torsion along a separating torus whose contact invariants do not vanish. This provides counterexamples to Ghiggini's conjecture and suggests that separating half Giroux torsion may not obstruct symplectic fillability. The main tools are the bordered contact invariants recently developed by the authors and the innermost contact structures on knot complements. We also show that there exists a closed contact…

Wieder ein spannendes Wochenende in #chemnitz!
Starker Tipp
https://chaos.social/@chch/114697409182100038

Chaostreff Chemnitz (@chch@chaos.social)
Attached: 1 image Kommt am Wochenende zur Makers United in die Chemnitzer Stadthalle. Freut euch auf unseren Arcade-Automaten, auf @ChaosErika, die wieder fleißig eure Fragen beantwortet (ja, sie tippt noch!), und auf unsere Lötstationenfür Jung und Alt. Außerdem sind zwei Maker aus Polen und den Niederlanden am Start. Wir freuen uns auf eure Fragen, Ideen und Gespräche über Technik, Kultur, Digitalisierung und alles dazwischen und außerhalb.

sp_high_school_new: High school dynamic contacts (2011-2012)
These datasets contain the temporal network of contacts between students in a high school in Marseilles, France. The first dataset gives the contacts of the students of three classes during 4 days in Dec. 2011, and the second corresponds to the contacts of the students of 5 classes during 7 days (from a Monday to the Tuesday of the following week) in Nov. 2012.
This network has 126 nodes and 28561 edges.
Tags: Soc…

[Thread] A new US paper shows the best frontier LLM models achieve 0% on hard real-life Programming Contest problems, domains where expert humans still excel (Rohan Paul/@rohanpaul_ai)
https://x.com/rohanpaul_ai/status/1934751145400111572

Rohan Paul (@rohanpaul_ai) on X
This is really BAD news of LLM's coding skill. ☹️ The best Frontier LLM models achieve 0% on hard real-life Programming Contest problems, domains where expert humans still excel. LiveCodeBench Pro, a benchmark composed of problems from Codeforces, ICPC, and IOI (“International

A note on Hall conductance and Hall conductivity in interacting Fermion systems
Stefan Teufel, Marius Wesle
https://arxiv.org/abs/2506.13581 https://

A note on Hall conductance and Hall conductivity in interacting Fermion systems
In this note we consider lattice fermions on $\mathbb{Z}^2$ with a gapped ground state and show how to apply the NEASS approach to linear response to derive the formula for the Hall conductance in terms of an expectation of a commutator of modified step functions. This formula is usually derived by a charge pumping argument going back to Laughlin. Here we show that it can also be obtained as the linear response coefficient of the microscopic current response to an adiabatic increase of the chem…

Topological Contextuality and Quantum Representations
Tzu-Miao Chou
https://arxiv.org/abs/2506.14537 https://arxiv.org/pdf/2506.14537…

Topological Contextuality and Quantum Representations
Quantum contextuality, a fundamental feature distinguishing quantum theory from classical models, is investigated via algebraic and topological structures inherent in modular tensor categories. This work rigorously demonstrates that braid group representations induced by modular categories, particularly those associated with SU(2) at level k and Fibonacci anyon models, exhibit state-dependent contextuality characterized by violations of noncontextuality inequalities. By explicitly constructing …

Trump Media and Technology Group files an S-1 with the US SEC to launch a spot Bitcoin and Ethereum ETF, allocating 75% to bitcoin and 25% to ether (Oliver Knight/CoinDesk)
https://www.coindesk.com/business/2025/06/16/d…

Donald Trump's Truth Social Files for Dual BTC and ETH ETF
The move follows registration for a standalone Truth Social bitcoin ETF earlier this month.