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We study the conjecture due to V.\,V. Shokurov on characterization of toric varieties. We also consider one generalization of this conjecture. It is shown that none of the characterizations holds true in dimension $\ge 3$. Some weaker…

Algebraic Geometry · Mathematics 2026-02-12 Ilya Karzhemanov

One of the main challenges in property testing is to characterize those properties that are testable with a constant number of queries. For unordered structures such as graphs and hypergraphs this task has been mostly settled. However, for…

Data Structures and Algorithms · Computer Science 2018-01-31 Omri Ben-Eliezer , Eldar Fischer

We study shrinking target problems and the set $\mathcal{E}_{\text{ah}}$ of eventually always hitting points. These are the points whose first $n$ iterates will never have empty intersection with the $n$-th target for sufficiently large…

Dynamical Systems · Mathematics 2020-01-29 Maxim Kirsebom , Philipp Kunde , Tomas Persson

We study whether iterated vector fields (vector fields composed with themselves) are conservative. We give explicit examples of vector fields for which this self-composition preserves conservatism. Notably, this includes gradient vector…

Optimization and Control · Mathematics 2021-11-16 Zachary Charles , Keith Rush

We show that it is possible to construct a well-defined effective field theory incorporating string winding modes without using strong constraint in double field theory. We show that X-ray (Radon) transform on a torus is well-suited for…

High Energy Physics - Theory · Physics 2016-06-22 Kanghoon Lee

We develop a "metrically selfdual" variational calculus for $c$-monotone vector fields between general manifolds $X$ and $Y$, where $c$ is a coupling on $X\times Y$. Remarkably, many of the key properties of classical monotone operators…

Analysis of PDEs · Mathematics 2015-12-10 Nassif Ghoussoub , Abbas Moameni

We show that when the genus and punctures of a surface are directly proportional by some rational number the minimal asymptotic translation length in the curve complex has behavior inverse to the square of the Euler characteristic. We also…

Geometric Topology · Mathematics 2013-10-18 Aaron D. Valdivia

Let $(X,T,\mu,d)$ be a metric measure-preserving system. If $B(x,r_n(x))$ is a sequence of balls such that, for each $n$, the measure of $B(x,r_n(x))$ is constant, then we obtain a self-norming CLT for recurrence for systems satisfying a…

Dynamical Systems · Mathematics 2025-11-21 Alejandro Rodriguez Sponheimer

In this article, we demonstrate the common fixed point theorems for three transformations on vector S-metric space by utilizing weakly compatible and point of coincidence. Moreover, some of our results generalize the existing results in the…

General Mathematics · Mathematics 2023-06-09 Pooja Yadav , Mamta Kamra

The graph translation operator has been defined with good spectral properties in mind, and in particular with the end goal of being an isometric operator. Unfortunately, the resulting definitions do not provide good intuitions on a…

Discrete Mathematics · Computer Science 2020-04-24 Benjamin Girault , Paulo Gonçalves , Shrikanth Narayanan , Antonio Ortega

We give a reduction of the irregular case for the effective non-vanishing conjecture by virtue of the Fourier-Mukai transform. As a consequence, we reprove that the effective non-vanishing conjecture holds on algebraic surfaces.

Algebraic Geometry · Mathematics 2008-02-27 Qihong Xie

Prescribed mean curvature problems on the torus has been considered in one dimension. In this paper, we prove the existence of a graph on the $n$-dimensional torus $\mathbb {T}^n$, the mean curvature vector of which equals the normal…

Analysis of PDEs · Mathematics 2020-11-12 Yuki Tsukamoto

We give a geometric criterion that guaranteesa purely singular spectral type for a dynamical system on a Riemannian manifold. The criterion, that is based on the existence of fairly rich but localized periodic approximations, is compatible…

Dynamical Systems · Mathematics 2007-05-23 Bassam Fayad

We prove a sufficient condition for the existence of explicit first integrals for vector fields which admit an integrating factor. This theorem recovers and extends previous results in the literature on the integrability of vector fields…

Dynamical Systems · Mathematics 2012-06-15 Jaume Llibre , Daniel Peralta-Salas

We define a flexible class of Riemmanian metrics on the three-torus. Then, using Stern's inequality relating scalar curvature to harmonic one-forms, we show that any sequence of metrics in this family whose negative part of the scalar…

Differential Geometry · Mathematics 2024-05-15 Edward Bryden , Lizhi Chen

We examine conditions under which projective limits of topological spaces are preserved by the continuous valuation functor $\mathbf V$ and its subprobability and probability variants (used to represent probabilistic choice), by the Smyth…

General Topology · Mathematics 2024-11-13 Jean Goubault-Larrecq

The purpose of this paper is to establish mixing rates for infinite measure preserving almost Anosov diffeomorphisms on the two-dimensional torus. The main task is to establish regular variation of the tails of the first return time to the…

Dynamical Systems · Mathematics 2018-01-16 Henk Bruin , Dalia Terhesiu

We present a phenomenological model for the mixing length used in turbulence models. It has the advantage of naturally accounting for the object's geometry while satisfying the standard symmetries of the Navier-Stokes equations. We employ…

We provide a characterisation of Schur multiplicative maps on both finite and infinite dimensional matrix spaces, and show that every surjective Schur multiplicative contraction is automatically an isometry. We also generalise this result…

Functional Analysis · Mathematics 2019-09-04 Ying-Fen Lin , Donal O'Cofaigh

We consider a lattice $\mathcal{L}\subset \mathbb{R}^n$ and a trigonometric potential $V$ with frequencies $k\in\mathcal{L}$. We then prove a strong integrability condition on $V$, using the support of its Fourrier transform. We then use…

Dynamical Systems · Mathematics 2017-09-13 Thierry Combot