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In this paper, we prove the conjecture that if there is an odd perfect number, then there are infinitely many of them.

Number Theory · Mathematics 2022-02-10 Jose Arnaldo Bebita Dris

We present exercises with solutions related to A Hyper-Catalan Series Solution to Polynomial Equations, and the Geode.

Combinatorics · Mathematics 2025-07-18 Dean Rubine

Polytopes from subgraph statistics are important in applications and conjectures and theorems in extremal graph theory can be stated as properties of them. We have studied them with a view towards applications by inscribing large explicit…

Combinatorics · Mathematics 2011-08-22 Alexander Engström , Patrik Norén

We prove the existence of multiple closed geodesics on non-compact cylindrica manifolds.

Analysis of PDEs · Mathematics 2007-05-23 Simone Secchi

The ternary Goldbach conjecture (or three-prime conjecture) states that every odd number greater than 5 can be written as the sum of three primes. The purpose of this book is to give the first proof of the conjecture, in full.

Number Theory · Mathematics 2015-01-29 Harald Andres Helfgott

Using generalized binomial coefficient identities and some results of John Dougall, we derive some families of series involving the cubes of Catalan numbers. We also establish a family of series containing fourth powers of Catalan numbers.…

Number Theory · Mathematics 2026-04-03 Kunle Adegoke

Let $I$ be the ideal generated by alternating polynomials in two sets of $n$ variables. Haiman proved that the $q,t$-Catalan number is the Hilbert series of the graded vector space $M(=\bigoplus_{d_1,d_2}M_{d_1,d_2})$ spanned by a minimal…

Combinatorics · Mathematics 2019-11-01 Kyungyong Lee , Li Li

This note is dedicated to presenting a polynomial analogue of $(n+1)!C_n=2^n(2n-1)!!$ (with $C_n$ as the $n$-th Catalan number) in the context of labeled plane trees and increasing plane trees, based on the definition of improper edges in…

Combinatorics · Mathematics 2025-10-06 Lora R. Du , Kathy Q. Ji , Dax T. X. Zhang

In this work we use the number classification in families of the form 6n+1, and 6n+5 with n integer (Such families contain all odd prime numbers greater than 3 and other compound numbers related with primes). We will use this kind of…

General Mathematics · Mathematics 2007-09-04 G. Funes , D. Gulich , L. Garvaglia , M. Garvaglia

In this note, we explore certain determinantal descriptions of the Robbins numbers. Techniques used for this include continued fractions, Riordan arrays and series inversion. Proven and conjectured representations involve the determinants…

Combinatorics · Mathematics 2021-04-09 Paul Barry

In this article, we provide an application of hypergeometric evaluation identities, including a strange valuation of Gosper, to prove several supercongruences related to special valuations of truncated hypergeometric series. In particular,…

Number Theory · Mathematics 2010-12-17 Ling Long

We introduce a new ``Winding Number Conjecture'' about maps from the $(d-1)$-skeleton of the $((d+1)(q-1))$-simplex into $\real^d$. This conjecture is equivalent to the Topological Tverberg Theorem. Furthermore, many statements about the…

Combinatorics · Mathematics 2007-05-23 Torsten Schöneborn

Hexaflexagons were popularized by the late Martin Gardner in his first Scientific American column in 1956. Oakley and Wisner showed that they can be represented abstractly by certain recursively defined permutations called pats, and deduced…

Combinatorics · Mathematics 2010-06-04 David Callan

We propound the thesis that there is a limitation to the number of possible structures which are axiomatically endowed with identities involving operations. In the case of algebras with a binary operation satisfying a formally reducible (to…

Rings and Algebras · Mathematics 2007-05-23 Constantin M. Petridi , P. B. Krikelis

We prove the existence of infinitely many low-lying and fundamental closed geodesics on the modular surface which are reciprocal, that is, invariant under time reversal. The method combines ideas from Parts I and II of this series, namely…

Number Theory · Mathematics 2019-12-19 Jean Bourgain , Alex Kontorovich

We provide a context around a conjectured closed form for the Hankel transform of linear combinations of consecutive pairs of Catalan numbers. This generalizes the formula for the Hankel transforms of the shifted Catalan numbers and the…

Combinatorics · Mathematics 2020-11-24 Paul Barry

Based on some combinatorial identities arising from symbolic summation, we extend two supercongruences on partial sums of hypergeometric series, which were originally conjectured by Guo and Schlosser and recently confirmed by Jana and…

Number Theory · Mathematics 2019-12-03 Ji-Cai Liu

A finitization of the Catalan numbers $ C_n $ can be defined as Euler characteristics of an algebraic structure. We conjecture the existence of a $ q $-deformed version of such structure, and provide evidence for the first two non-trivial…

Combinatorics · Mathematics 2020-11-20 Keke Zhang

Introduced by Goulden and Jackson in their 1996 paper, the matchings-Jack conjecture and the hypermap-Jack conjecture (also known as the $b$-conjecture) are two major open questions relating Jack symmetric functions, the representation…

Combinatorics · Mathematics 2017-12-25 Andrei L. Kanunnikov , Valentin V. Promyslov , Ekaterina A. Vassilieva

We give conjectures on the possible graded Betti numbers of Cohen-Macaulay modules up to multiplication by positive rational numbers. The idea is that the Betti diagrams should be non-negative linear combinations of pure diagrams. The…

Commutative Algebra · Mathematics 2014-02-26 Mats Boij , Jonas Söderberg