Tootfinder

(€) In #Tübingen liefert ein neuer #Solarthermie-Park seit Oktober klimafreundliche #Fernwärme.
Die Anlage mit 23.000 Quadratmetern

Salzseifen, Sandstein-Edition
#Soapmaking

DJI Osmo Action 6: Actionkamera mit variabler Blende
Die Actioncam DJI Osmo Action 6 kommt mit einem 1/1,1-Zoll-Quadratsensor, der hohe Bildqualität verspricht. Die Blende lässt sich von f/2,0 – f/4,0 variieren.
https:/…

1987 war zumindest eine Zeit mit besonderen Designs. Hier der Titel einer schulpolitischen Broschüre der baden-württembergischen Grünen aus dieser Zeit.

from my link log —
Two workers are quadratically better than one: modelling a queue with PRISM.
https://www.hillelwayne.com/post/queueing-prism/
saved 2020-11-02

by accident i stumbled on this review by the #NSA on Bruce Schneiers "Applied Crypto" book from long ago.

Kronecker second limit formula for real quadratic fields
YoungJu Choie, Rahul Kumar
https://arxiv.org/abs/2510.10554 https://arxiv.org/pdf/2510.10554

Kronecker second limit formula for real quadratic fields
In this paper, the second Kronecker ``limit" formula for a real quadratic field is established for the first time. More precisely, we obtain the second Kronecker limit formula of Zagier's zeta function. Using the reduction theory of Zagier, which connects Zagier's zeta function to the zeta function of real quadratic fields, we express the values of the zeta function of narrow ideal classes in real quadratic fields at natural arguments in terms of an analytic function which we call the \emph{hig…

Linear Convergence of a Unified Primal--Dual Algorithm for Convex--Concave Saddle Point Problems with Quadratic Growth
Cody Melcher, Afrooz Jalilzadeh, Erfan Yazdandoost Hamedani
https://arxiv.org/abs/2510.11990

Linear Convergence of a Unified Primal--Dual Algorithm for Convex--Concave Saddle Point Problems with Quadratic Growth
In this paper, we study saddle point (SP) problems, focusing on convex-concave optimization involving functions that satisfy either two-sided quadratic functional growth (QFG) or two-sided quadratic gradient growth (QGG)--novel conditions tailored specifically for SP problems as extensions of quadratic growth conditions in minimization. These conditions relax the traditional requirement of strong convexity-strong concavity, thereby encompassing a broader class of problems. We propose a generali…

On the Walsh spectra of quadratic APN functions
Sophie Hannah B\'en\'eteau, Nicolas Goluboff, Lukas K\"olsch, Divyesh Vaghasiya
https://arxiv.org/abs/2510.12008 htt…

On the Walsh spectra of quadratic APN functions
APN functions play a central role as building blocks in the design of many block ciphers, serving as optimal functions to resist differential attacks. One of the most important properties of APN functions is their linearity, which is directly related to the Walsh spectrum of the function. In this paper, we establish two novel connections that allow us to derive strong conditions on the Walsh spectra of quadratic APN functions. We prove that the Walsh transform of a quadratic APN function $F$ op…

On the quadratic complexity of subsets of $\mathbb{F}_p^n$ of bounded $\mathrm{VC_{2}}$-dimension
C. Terry, J. Wolf
https://arxiv.org/abs/2510.12767 https://

On the quadratic complexity of subsets of $\mathbb{F}_p^n$ of bounded $\mathrm{VC_{2}}$-dimension
In prior work, we showed that subsets of $\mathbb{F}_{p}^{n}$ of $\mathrm{VC_{2}}$-dimension at most $k$ are well approximated by a union of atoms of a quadratic factor of complexity $(\ell,q)$, where the complexity $\ell$ of the linear part and the complexity $q$ of the quadratic part are both bounded in terms of $k$, $p$, and the desired level of approximation $μ$. A key tool in the proof of this result was an arithmetic regularity lemma for the Gowers $U^3$-norm by Green and Tao, which resu…