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This article, written for undergraduate mathematics students, provides an accessible introduction to a few key problems in tiling theory: Heesch's problem, the isohedral number problem, and the existence of an aperiodic monotile. I…

历史与综述 · 数学 2025-09-17 Craig S. Kaplan

We survey the classical results of the Dirichlet Approximation Theorem.

经典分析与常微分方程 · 数学 2007-05-23 Yong-Cheol Kim

We show that an inequality related to Newton's inequality provides one more relation between skewness and kurtosis. This also gives simple and alternative proofs of the bounds for skewness and kurtosis.

统计理论 · 数学 2016-02-16 R. Sharma , R. Bhandari

For the first time a method is devised for non-iterative modeling of motion of a radiating, electrified pointlike mass that has an internal structure. New, supplementary kinetic constants of accelerated charged particles are defined, that…

综合物理 · 物理学 2010-05-24 Marijan Ribarič , Luka Šušteršič

A conjecture regarding the structure of expander graphs is discussed.

组合数学 · 数学 2020-10-20 Itai Benjamini , Mikolaj Fraczyk

I state some open problems coming from joint work with Paul Erd\H{o}s

组合数学 · 数学 2013-07-09 András Gyárfás

E731 in the Enestrom index. Originally published as "Solutio problematis ob singularia calculi artificia memorabilis", Memoires de l'academie des sciences de St-Petersbourg 2 (1810), 3-9. For $z$ the distance from the origin, and $v$ a…

历史与综述 · 数学 2007-10-23 Leonhard Euler

This article seeks to encourage a mathematical dialog regarding a possible solution to Beals Conjecture. It breaks down one of the worlds most difficult math problems into laymans terms and encourages people to question some of the most…

历史与综述 · 数学 2015-01-12 Angela Moore

While the constant radial acceleration problem is known to be integrable and has received some recent attention in an orbital mechanics context, a closed form explicit solution, relating the state variables to a time parameter, has eluded…

数学物理 · 物理学 2015-10-27 Dario Izzo , Francesco Biscani

This is a quick survey of theoretical and experimental efforts to understand and identify the Odderon.

高能物理 - 唯象学 · 物理学 2022-01-19 Vladimir Petrov , Nikolay Tkachenko

This is a short survey article written for the Erd\H{o}s centennial conference in Budapest in 2013. The main two topics covered are Szemer\'edi's theorem and its ramifications, and the Erd\H{o}s discrepancy problem. There is an emphasis on…

组合数学 · 数学 2015-09-14 W. T. Gowers

We show that some mathematical results and their negations are both deducible. The derived contradictions indicate the inconsistency of current mathematics. This paper is an updated version of arXiv:math/0606635v3 with additional results…

综合数学 · 数学 2007-08-15 Guang-Liang Li , Victor O. K. Li

In this paper, we investigate two variations on the so-called persistence problem of Sloane: the shifted version, which was introduced by Wagstaff; and the nonzero version, proposed by Erd\H{o}s. We explore connections between these…

数论 · 数学 2020-10-22 Gabriel Bonuccelli , Lucas Colucci , Edson de Faria

We present here a note which synthesizes our previous ideas concerning some problems in cosmology, and the numerical correspondences between the physical constants that we could deduce.

综合物理 · 物理学 2008-02-06 Christophe Real

The inconsistencies involved in the foundation of set theory were invariably caused by infinity and self-reference; and only with the opportune axiomatic restrictions could them be obviated. Throughout history, both concepts have proved to…

综合数学 · 数学 2012-01-25 Antonio Leon

In this note, we construct solutions to the 2D Euler equations which belong to the Yudovich class but lose $W^{1,p}$ regularity continuously with time.

偏微分方程分析 · 数学 2021-08-24 In-Jee Jeong

This article is a guide to theorems on existence and global dynamics of solutions of the Einstein equations. It draws attention to open questions in the field. The local-in-time Cauchy problem, which is relatively well understood, is…

广义相对论与量子宇宙学 · 物理学 2015-06-25 Alan D. Rendall

We review some outstanding puzzles and experimental anomalies in hadron physics that appear to challenge conventional wisdom and, in some cases, the foundations of QCD. We also discuss possible solutions and propose new tests and…

高能物理 - 唯象学 · 物理学 2013-02-25 Stanley J. Brodsky , Guy de Teramond , Marek Karliner

We study the continuity equation of the Gauduchon metrics and establish its interval of maximal existence, which extends the continuity equation of the K\"ahler metrics introduced by La Nave \& Tian for and of the Hermitian metrics…

微分几何 · 数学 2020-04-15 Tao Zheng

This is a survey of old and new problems and results in additive number theory.

数论 · 数学 2025-10-28 Melvyn B. Nathanson