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We prove a generalizations of the Elekes-Szab\'o theorem for relations definable in strongly minimal structures that are interpretable in distal structures.

Logic · Mathematics 2020-07-24 Artem Chernikov , Sergei Starchenko

A short proof is given for the well-known Choi-Effros theorem on the structure of ranges of completely positive projections.

Operator Algebras · Mathematics 2013-04-29 Bebe Prunaru

We present a short proof of Szemer\'edi's Theorem using a dynamical system enriched by ideas from model theory. The resulting proof contains features reminiscent of proofs based on both ergodic theory and on hypergraph regularity.

Logic · Mathematics 2011-01-27 Henry Towsner

A short proof of the Mazur-Ulam theorem concerning isometries of real normed spaces.

Metric Geometry · Mathematics 2013-06-12 Bogdan Nica

In this note, we combine ideas of several previous proofs in order to obtain a quite short proof of Gr\"otzsch theorem.

Combinatorics · Mathematics 2013-12-02 Zdeněk Dvořák

We give an elementary proof of Kelley's theorem based on a minimax argument. Some applications to related problems are also developed.

Functional Analysis · Mathematics 2019-09-24 Gianluca Cassese

A very short and direct proof along the lines of the Kamae-Katznelson-Weiss approach.

Dynamical Systems · Mathematics 2007-05-23 Karl Petersen

We provide a short proof of the 1-dimensional flat chain conjecture.

Metric Geometry · Mathematics 2026-04-01 Philippe Bouafia , Thierry De Pauw

We use Herbrand's theorem to give a new proof that Euclid's parallel axiom is not derivable from the other axioms of first-order Euclidean geometry. Previous proofs involve constructing models of non-Euclidean geometry. This proof uses a…

Logic · Mathematics 2015-11-10 Michael Beeson , Pierre Boutry , Julien Narboux

The aim of this short note is to present an elementary, self-contained, and direct proof for the classical Lebesgue decomposition theorem.

Functional Analysis · Mathematics 2014-04-08 Tamás Titkos

In this short paper we review and extract some features of the Fredholm Alternative problem .

Functional Analysis · Mathematics 2010-11-22 Ali Reza Khatoon Abadi , H. R. Rezazadeh

In this note we show that McGee's {\omega}-inconsistency result can be derived from L\"ob's theorem.

Logic · Mathematics 2017-04-28 Johannes Stern

We give a simple proof of the increasing strengthening of Arhangel'skii's Theorem. Our proof naturally leads to a refinement of this result of Juh\'asz.

General Topology · Mathematics 2011-12-09 Santi Spadaro

It is discussed that Zeeman's theorem can be directly obtained from Liouville's theorem if we assume sufficient differentiability.

Mathematical Physics · Physics 2013-11-12 Do-Hyung Kim

Wedderburn's theorem on the structure of finite dimensional semisimple algebras is proved by using minimal prerequisites.

Rings and Algebras · Mathematics 2009-02-03 Matej Bresar

Godsil observed the simple fact that the multiplicity of 0 as a root of the matching polynomial of a graph coincides with the classical notion of deficiency. From this fact he asked to what extent classical results in matching theory…

Combinatorics · Mathematics 2008-07-01 Cheng Yeaw Ku , William Chen

This paper is an extension program of the notion of circle of partition developed in our first paper \cite{CoP}. As an application we prove the Erd\H{o}s-Tur\'{a}n additive base conjecture.

Number Theory · Mathematics 2024-03-12 Theophilus Agama

Using geometric homology and cohomology we give a simple and conceptual proof of the Thom isomorphism theorem.

Algebraic Topology · Mathematics 2007-05-23 Martin Jakob

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

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

We prove an Erd\H{o}s--Tur\'an type inequality for compact Lie groups, from which we deduce an effective version of Deligne's equidistribution theorem.

Number Theory · Mathematics 2024-06-28 Lei Fu , Yuk-Kam Lau , Ping Xi