Tootfinder

Seit Jahren fällt auf, wer in #Russland gegenüber der Politik des Präsidenten #Putin Kritik äußert, wird vom "Pech verfolgt".
Mal geht ein Raubüberfall tödlich aus, zufällig kommt man in Kontakt mit tödlichen Substanzen wie Polonium oder Nowitschok, andere stürzen tragisch u. fallen aus e…

A few windows in the French Quarter of New Orleans.
1) Conti Street
2) Bienville Street
3) Jackson Brewery
4) Chartres Street
Photos by Infrogmation of New Orleans
@…
#NewOrleans

Sums of squares of k-term forms
Charu Goel, Bruce Reznick
https://arxiv.org/abs/2403.08697 https://arxiv.org/pdf/2403.08697

Sums of squares of k-term forms
In this paper we study the cones corresponding to sums of squares of $n$-ary $d$-ic forms with at most $k$ terms. We show that these are strictly nested as $k$ increases, leading to the usual sum of squares cone. We also discuss the duals of these cones. For $n \ge 3$, we construct indefinite irreducible $n$-ary $d$-ic forms with exactly $k$ terms for $2 \le k \le \binom{n+d-1}{n-1}$.

First 2D electron density measurements using Coherence Imaging Spectroscopy in the MAST-U Super-X divertor
N. Lonigro, R. Doyle, J. S. Allcock, B. Lipschultz, K. Verhaegh, C. Bowman, D. Brida, J. Harrison, O. Myatra, S. Silburn, C. Theiler, T. A. Wijkamp, MAST-U Team, the EUROfusion Tokamak Exploitation Team
https://arxiv.org/ab…

First 2D electron density measurements using Coherence Imaging Spectroscopy in the MAST-U Super-X divertor
2D profiles of electron density and neutral temperature are inferred from multi-delay Coherence Imaging Spectroscopy data of divertor plasmas using a non-linear inversion technique. The inference is based on imaging the spectral line-broadening of Balmer lines and can differentiate between the Doppler and Stark broadening components by measuring the fringe contrast at multiple interferometric delays simultaneously. The model has been applied to images generated from simulated density profiles t…