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The two-sided quaternion Fourier transform satisfies some uncertainty principles similar to the Euclidean Fourier transform. A generalization of Beurling's theorem, Hardy, Cowling-Price and Gelfand-Shilov theorems, is obtained for the…

Classical Analysis and ODEs · Mathematics 2019-02-18 Youssef El Haoui , Said Fahlaoui

The Modern Theory of Polarization, which rigorously defines the spontaneous electric polarization of a periodic solid and provides a recipe for its computation in electronic structure codes, transformed our understanding of ferroelectricity…

Materials Science · Physics 2026-01-23 Nicola A. Spaldin

In this note, we present a simple directed graph proof of Sharkovsky's theorem.

Dynamical Systems · Mathematics 2007-05-23 Bau-Sen Du

This paper concerns diffraction-tomographic reconstruction of an object characterized by its scattering potential. We establish a rigorous generalization of the Fourier diffraction theorem in arbitrary dimension, giving a precise relation…

Numerical Analysis · Mathematics 2026-03-30 Clemens Kirisits , Michael Quellmalz , Eric Setterqvist

Beginning from the resolution of Dirichlet L function, using the inner product formula of infinite-dimensional vectors in the complex space, the author proved the world's baffling problem--Generalized Riemann hypothesis.

General Mathematics · Mathematics 2007-05-23 Kaida Shi

A generalization of L{\"u}roth's theorem expresses that every transcendence degree 1 subfield of the rational function field is a simple extension. In this note we show that a classical proof of this theorem also holds to prove this…

Commutative Algebra · Mathematics 2022-09-23 François Ollivier , Brahim Sadik

In this note, we present a simple non-directed graph proof of Sharkovsky's theorem which is different from the one given in [2].

Dynamical Systems · Mathematics 2007-05-23 Bau-Sen Du

We prove a generalization of Frieman's $3k-3$ theorem for the sumset $$ \Sigma^{l}(A_1,\ldots,A_k)=\{a_{j_{1}}+\cdots+a_{j_{l}}:\,1\leq j_{1}<\cdots<j_{l}\leq k,\ a_{j_{s}}\in A_{j_{s}}\text{ for all }s\}. $$

Number Theory · Mathematics 2016-09-13 Shanshan Du , Hao Pan

The two parameter generalization of the complete elliptic integral of the second kind discussed recently by Barsan is expressed in terms of ordinary complete elliptic integrals.

Mathematical Physics · Physics 2007-09-11 M. L. Glasser

The objective of this paper is to describe the structure of Zariski closed algebras, which provide a useful generalization to finite dimensional algebras in the study of representable algebras over finite fields. Our results include a…

Rings and Algebras · Mathematics 2011-09-23 Alexei Belov-Kanel , Louis H. Rowen , Uzi Vishne

The result of this paper is proved in arXiv:1112.1163

Algebraic Geometry · Mathematics 2011-12-09 Kefeng Liu , Andrey Todorov , Xiaofeng Sun , Shing-Tung Yau

In this paper, we reprove a global converse theorem of Cogdell and Piatetski-Shapiro using purely global methods.

Number Theory · Mathematics 2017-03-16 Herve Jacquet , Baiying Liu

The purpose of this short note is to present a simplified proof of Serre's modularity conjecture using the strong modularity lifting results currently available. This second version includes extra details on definitions and proofs than the…

Number Theory · Mathematics 2022-05-04 Luis Victor Dieulefait , Ariel Martín Pacetti

It is well known, that Luzin's conjecture has a positive solution for one dimensional trigonometric Fourier series and it is still open for the spherical partial sums $S_\lambda f(x)$, $f\in L_2(\mathbb{T}^N)$, of multiple Fourier series,…

Analysis of PDEs · Mathematics 2019-12-10 Ravshan Ashurov

In this short note we have proved an enhanced version of a theorem of Lorentz [1] and its generalization to the multivariate case which gives a non- uniform estimate of degree of approximation by a polynomial with positive coefficients. The…

Classical Analysis and ODEs · Mathematics 2016-11-30 Zhong Guan , Tao Wang

We provide a new proof of the fractional version of the De Giorgi conjecture for the Allen-Cahn equation in $\mathbb{R}^2$ for the full range of exponents. Our proof combines a method introduced by A. Farina in 2003 with the $s$-harmonic…

Analysis of PDEs · Mathematics 2025-03-11 Serena Dipierro , João Gonçalves da Silva , Giorgio Poggesi , Enrico Valdinoci

In this note, we give a short proof of the Torelli theorem for cubic fourfolds that relies on the global Torelli theorem for irreducible holomorphic symplectic varieties proved by Verbitsky.

Algebraic Geometry · Mathematics 2012-09-21 François Charles

For any given finite abelian group, we give factorizations of the group determinant in the group algebra of any subgroup. The factorizations are an extension of Dedekind's theorem. The extension leads to a generalization of Dedekind's…

Representation Theory · Mathematics 2023-03-03 Naoya Yamaguchi

In this paper we propose and solve a generalization of the Bernoulli Differential Equation, by means of a generalized fractional derivative. First we prove a generalization of Gronwall's inequality, which is useful for studying the…

General Mathematics · Mathematics 2023-08-01 Hector Carmenate , Paul Bosch , Juan E. Nápoles , José M. Sigarreta

In this paper for superparacompact complete metrizable spaces the Freudenthal's theorem for compact irreducible standard polyhedric representation is generalized. Furthermore, for superparacompact metric spaces are reinforced: 1) the…

General Topology · Mathematics 2013-04-03 D. K. Musaev , D. I. Jumaev
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