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In this work we develop the theory of solution-regions with a constructive approach. We also extend the theory to the case of general linear conditions and provide various sets of sufficient hypotheses for existence and multiplicity…

Classical Analysis and ODEs · Mathematics 2019-09-10 F. Adrián F. Tojo

We present a constructive proof of Ky Fan's combinatorial lemma concerning labellings of triangulated spheres. Our construction works for triangulations of $S^n$ that contain a flag of hemispheres. As a consequence, we produce a…

Combinatorics · Mathematics 2007-05-23 Timothy Prescott , Francis Edward Su

New version, including a variant of Quillen's proof of the Solomon-Tits theorem.

K-Theory and Homology · Mathematics 2014-07-03 Bruno Kahn

This paper presents a short and simple proof of the Four-Color Theorem that can be utterly checkable by human mathematicians, without computer assistance. The new key idea that has allowed it and the global structure of the proof are…

Discrete Mathematics · Computer Science 2019-11-05 André Luiz Barbosa

We give a constructive proof of the Carath\'eodory Theorem by means of the concept of a modulus of local connectivity and the extremal distance of the separating curves of an annulus.

Complex Variables · Mathematics 2015-01-08 Timothy H. McNicholl

In this paper we prove the weighted martingale Carleson Embedding Theorem with matrix weights both in the domain and in the target space.

Classical Analysis and ODEs · Mathematics 2017-08-25 Amalia Culiuc , Sergei Treil

We construct a countable simple theory which, in Keisler's order, is strictly above the random graph (but "barely so") and also in some sense orthogonal to the building blocks of the recently discovered infinite descending chain. As a…

Logic · Mathematics 2019-07-29 M. Malliaris , S. Shelah

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

In this paper, we give a bijective proof of the reduced lecture hall partition theorem. It is possible to extend this bijection in lecture hall partition theorem. And refined versions of each theorems are also presented.

Combinatorics · Mathematics 2015-04-17 Masanori Ando

In this paper an algebraic proof of Christoph's theorem is provided. This theorem from algebraic-geometry is about the existence of a finite automaton for computing coefficient of a series for an algebraic function.

Algebraic Geometry · Mathematics 2023-12-01 Sergey Malev , Anastasiia Zhilina

We present an exposition of the proof of the induced bipartite Ramsey Theorem.

Combinatorics · Mathematics 2024-01-11 William Gasarch , Gary Peng

In this article, we prove a weighted version of Saitoh's conjecture. As an application, we prove a weighted version of Saitoh's conjecture for higher derivatives.

Complex Variables · Mathematics 2022-08-17 Qi'an Guan , Zheng Yuan

G\"odel's argument for the First Incompleteness Theorem is, structurally, a proof by contradiction. This article intends to reframe the argument by, first, isolating an additional assumption the argument relies on, and then, second, arguing…

Logic · Mathematics 2020-07-02 Joachim Derichs

We study a weighted version of Carleman's inequality via Carleman's original approach. As an application of our result, we prove a conjecture of Bennett.

Classical Analysis and ODEs · Mathematics 2007-06-19 Peng Gao

This is a translation of a final paper. It contains proofs of some well-known Positivstellens\"atze. The approach in this paper differs in two respects from presentations in literature. We use the Stone-Weierstrass Theorem directly to prove…

Algebraic Geometry · Mathematics 2014-11-18 Christoph Schulze

In this paper we show an index theorem for gerbes

Differential Geometry · Mathematics 2007-05-23 Aristide Tsemo , Isaac Woungang

We present axioms for the real numbers by omitting the field axioms and then derive the field properties of the real numbers. We prove all our theorems constructively.

Logic · Mathematics 2021-09-13 Jean S. Joseph

We find that second order quantification is problematic when a quantified concept variable is supposed to function predicatively. This issue is analyzed and it is shown that a constructive interpretation of the falling under relation…

Logic · Mathematics 2013-12-13 Nik Weaver

We prove a theorem of Tits type about automorphism groups for compact Kahler manifolds, which has been conjectured in the paper [KOZ].

Dynamical Systems · Mathematics 2018-09-24 De-Qi Zhang

We give a counting based proof of the Graham Pollak Theorem

Combinatorics · Mathematics 2011-01-14 Sundar Vishwanathan