Tootfinder

A lot of people here dogpiling on this screenshot, but if anybody bothered to check the guy’s bio or his other posts they’d find it’s meant to be a joke in an Andy Kaufman way.
https://mastodon.social/@dangillmor/114701270370709694

Dan Gillmor (@dangillmor@mastodon.social)
Attached: 1 image Seen on Bluesky: Guy explains to CEO of Signal (messaging) that it's going to add "AI" to the service. She says no. He insists, not knowing or caring who he's talking down to.

Extracting transient Koopman modes from short-term weather simulations with sparsity-promoting dynamic mode decomposition
Zhicheng Zhang, Yoshihiko Susuki, Atsushi Okazaki
https://arxiv.org/abs/2506.14083

Extracting transient Koopman modes from short-term weather simulations with sparsity-promoting dynamic mode decomposition
Convective features-here represented as warm bubble-like patterns-reveal essential, high-level information about how short-term weather dynamics evolve within a high-dimensional state space. We introduce a data-driven framework that uncovers transient dynamics captured by Koopman modes responsible for these structures and traces their emergence, growth, and decay. Our approach incorporates the sparsity-promoting dynamic mode decomposition into the framework of Koopman mode decomposition, yieldi…

Life Finds A Way: Emergence of Cooperative Structures in Adaptive Threshold Networks
Sean P. Maley, Carlos Gershenson, Stuart A. Kauffman
https://arxiv.org/abs/2507.13253

Life Finds A Way: Emergence of Cooperative Structures in Adaptive Threshold Networks
There has been a long debate on how new levels of organization have evolved. It might seem unlikely, as cooperation must prevail over competition. One well-studied example is the emergence of autocatalytic sets, which seem to be a prerequisite for the evolution of life. Using a simple model, we investigate how varying bias toward cooperation versus antagonism shapes network dynamics, revealing that higher-order organization emerges even amid pervasive antagonistic interactions. In general, we o…

Improved error bounds for Koopman operator and reconstructed trajectories approximations with kernel-based methods
Diego Olgu\'in, Axel Osses, H\'ector Ram\'irez
https://arxiv.org/abs/2506.09266

Improved error bounds for Koopman operator and reconstructed trajectories approximations with kernel-based methods
In this article, we propose a new error bound for Koopman operator approximation using Kernel Extended Dynamic Mode Decomposition. The new estimate is $O(N^{-1/2})$, with a constant related to the probability of success of the bound, given by Hoeffding's inequality, similar to other methodologies, such as Philipp et al. Furthermore, we propose a \textit{lifting back} operator to obtain trajectories generated by embedding the initial state and iterating a linear system in a higher dimension. Thi…

What’s Right - interessante aflevering “in Holland stond een huis” op #npo2: hoe de kabinetten Rutte de volkshuisvesting volledig in de vernieling hebben gedraaid, zowel voor huur- als voor koopwoningen.

Chromatic spherical invariant and Hennings invariant of 3-dimensional manifolds
Julie Reina
https://arxiv.org/abs/2507.06019 https://…

Chromatic spherical invariant and Hennings invariant of 3-dimensional manifolds
This paper establishes a relation between two invariants of $3$-dimensional manifolds: the chromatic spherical invariant $\mathcal{K}$ and the Hennings-Kauffman-Radford invariant $\operatorname{HKR}$. We show that, for a spherical Hopf algebra $H$, the invariant $\mathcal{K}$ associated to the pivotal category of finite-dimensional $H$-modules is equal to the invariant $\operatorname{HKR}$ associated to the Drinfeld double $D(H)$ of the same Hopf algebra.

@… Ich gähne nur und sehe den »Hyperloop unter den Parteien« von einem grenzbetrügerischen Vaporware-Kaufmann angekündigt.

Detecting alien living worlds and photosynthetic life using imaging polarimetry with the HWO coronagraph
Svetlana Berdyugina, Lucas Patty, Jonathan Grone, Brice Demory, Kim Bott, Vincent Kofman, Giulia Roccetti, Kenneth Goodis Gordon, Frans Snik, Theodora Karalidi, Victor Trees, Daphne Stam, Mary N. Parenteau
https://arxiv.org/a…

Detecting alien living worlds and photosynthetic life using imaging polarimetry with the HWO coronagraph
Our Earth, being the only living planet that we know, provides us with clues that photosynthetic life-forms may be dominant on other exoplanets for billions of years. Spectropolarimetric signatures of the terrestrial photosynthetic life (PSLife) are well studied in the lab and remotely sensed with space and airborne instrumentation. An astonishing biosignature revealed by these measurements is an extremely strong linear polarization (tens \%) associated with broad absorption bands of biological…

A causal evaluation of Bogota's cable car illustrates the transformative potential of mobile phone data for policy analysis
Elena Lutz, Sam Heroy, David Kaufmann, Neave O'Clery
https://arxiv.org/abs/2506.09311

A causal evaluation of Bogota's cable car illustrates the transformative potential of mobile phone data for policy analysis
Transport infrastructure is vital to the functioning of cities. However, assessing the impact of transport policies on urban mobility and behaviour is often costly and time-consuming, particularly in low-data environments. We demonstrate how GPS location data derived from smartphones, available at high spatial granularity and in near real time, can be used to conduct causal impact evaluation, capturing broad mobility and interaction patterns beyond the scope of traditional sources such as surve…

Illinois Governor JB Pritzker announces he's running for a third term (Elyssa Kaufman/CBS News)
https://www.cbsnews.com/chicago/news/illinois-governor-pritzker-running-for-third-term/
http://www.memeorandum.com/250626/p75#a250626p75