Tootfinder

La pression et les boycotts peuvent fonctionner
Premier Tech s’attend Š un nouveau nom sans « Israel »
https://www.lapresse.ca/sports/cyclisme/2025-09-23/equipe-israel-premier-tech/premier-t…

On the isomorphism problem for cyclic JSJ decompositions: vertex elimination
Dario Ascari, Montserrat Casals-Ruiz, Ilya Kazachkov
https://arxiv.org/abs/2507.16482 https://

On the isomorphism problem for cyclic JSJ decompositions: vertex elimination
We introduce two new moves on graphs of groups with cyclic edge groups that preserve the fundamental group. These moves allow us to address the isomorphism problem without the use of expansions, therefore keeping the number of vertices and edges constant along sequences of moves witnessing an isomorphism between two groups. We further show that the isomorphism problem for a large family of cyclic JSJ decompositions reduces to the case of generalized Baumslag-Solitar groups (GBS), and that among…

Efficiently Computing the Cyclic Output-to-Output Gain
Daniel Arnstr\"om, Andr\'e M. H. Teixeira
https://arxiv.org/abs/2509.16665 https://arxiv.or…

Efficiently Computing the Cyclic Output-to-Output Gain
The cyclic output-to-output gain is a security metric for control systems. Commonly, it is computed by solving a semi-definite program, which scales badly and inhibits its use for large-scale systems. We propose a method for computing the cyclic output-to-output gain using Hamiltonian matrices, similar to existing methods for the $H_\infty$-norm. In contrast to existing methods for the $H_{\infty}$-norm, the proposed method considers generalized singular values rather than regular singular valu…

The Cyclic Sieving Phenomenon and frieze patterns
Ashleigh Adams, Esther Banaian
https://arxiv.org/abs/2509.17258 https://arxiv.org/pdf/2509.17258

The Cyclic Sieving Phenomenon and frieze patterns
We exhibit two instances of the cyclic sieving phenomenon - one on dissections of a polygon of a fixed type and one on triangulations of a once-punctured polygon. We use these results to give refined enumerations of certain families of frieze patterns. We also give an interpretation of finite, positive integral frieze patterns fixed under nontrivial rotations as frieze patterns from a family of orbifolds and show that these are always unitary. Finally, we give a bijection between Holm-Jorgensen…

🔊 #NowPlaying on #BBCRadio3:
#ThroughTheNight
- Tribute to Pau Casals and Victoria de los Angeles
Benjamin Appl and Jorge Viladoms perform a song recital dedicated to the composer and cellist Pau Casals, and the soprano Victoria de los Angeles.
Relisten now 👇
https://www.bbc.co.uk/programmes/m002jj3d

Construction of Self-Orthogonal Quasi-Cyclic Codes and Their Application to Quantum Error-Correcting Codes
Mengying Gao, Yuhua Sun, Tongjiang Yan, Chun'e Zhao
https://arxiv.org/abs/2507.17319

Construction of Self-Orthogonal Quasi-Cyclic Codes and Their Application to Quantum Error-Correcting Codes
In this paper, necessary and sufficient conditions for the self-orthogonality of t-generator quasi-cyclic (QC) codes are presented under the Euclidean, Hermitian, and symplectic inner products, respectively. Particularly, by studying the structure of the dual codes of a class of 2-generator QC codes, we derive necessary and sufficient conditions for the QC codes to be dual-containing under the above three inner products. This class of 2-generator QC codes generalizes many known codes in the lit…

Automorphisms of graphs of groups with cyclic edge groups
Dario Ascari, Montserrat Casals-Ruiz, Ilya Kazachkov
https://arxiv.org/abs/2507.16489 https://arx…

Automorphisms of graphs of groups with cyclic edge groups
We describe the outer automorphism group of a one-ended fundamental group of a graph of groups, when edge groups are cyclic, and vertex groups are torsion-free with cyclic centralizers. We show that in this case the outer automorphism group is virtually built from the outer automorphisms of the vertex groups (fixing some elements), the outer automorphisms of some associated generalized Baumslag-Solitar groups, and generalized twists - partial conjugations by elements in the centralizers of some…

Lifting of cycles in functional graphs
Tadahisa Nara
https://arxiv.org/abs/2509.16234 https://arxiv.org/pdf/2509.16234

Lifting of cycles in functional graphs
For a given function from a set to itself, we can define a directed graph called the functional graph, where the vertices are the elements of the set, and the edges are all the pairs of inputs and outputs for the function. In this article we consider functional graphs on Z/mZ with respect to polynomial functions. The main result describes the behavior of cycles in functional graphs on Z/p^nZ while $n$ is increasing, where $p$ is a prime number.

New constructions of cyclic constant-dimension subspace codes based on Sidon spaces and subspace polynomials
Gang Wang, Ming Xu, You Gao
https://arxiv.org/abs/2509.18704 https:/…

New constructions of cyclic constant-dimension subspace codes based on Sidon spaces and subspace polynomials
In this paper, two new constructions of Sidon spaces are given by tactfully adding new parameters and flexibly varying the number of parameters. Under the parameters $ n= (2r+1)k, r \ge2 $ and $p_0=\max \{i\in \mathbb{N}^+: \lfloor \frac{r}{i}\rfloor>\lfloor \frac{r}{i+1} \rfloor \}$, the first construction produces a cyclic CDC in $\mathcal{G}_q(n, k)$ with minimum distance $2k-2$ and size $\frac{\left((r+\sum\limits_{i=2}^{p_0}(\lfloor \frac{r}{i}\rfloor-\lfloor \frac{r}{i+1} \rfloor))(q^k-1)…

Conjugacy in fibre products, distortion, and the geometry of cyclic subgroups
Martin R Bridson
https://arxiv.org/abs/2507.17598 https://arxiv.org/pdf/2507.…

Conjugacy in fibre products, distortion, and the geometry of cyclic subgroups
We investigate the complexity of the conjugacy problem for fibre products in torsion-free hyperbolic groups. Let $G$ be a torsion-free hyperbolic group and let $P