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We show that the classical algebra of quaternions is a commutative $\Z_2\times\Z_2\times\Z_2$-graded algebra. A similar interpretation of the algebra of octonions is impossible.

Commutative Algebra · Mathematics 2008-11-03 Sophie Morier-Genoud , Valentin Ovsienko

The continued fraction expansion of an irrational number $\alpha$ is eventually periodic if and only if $\alpha$ is a quadratic irrationality. However, very little is known regarding the size of the partial quotients of algebraic real…

Number Theory · Mathematics 2012-05-07 Boris Adamczewski , Yann Bugeaud

In this paper, we introduce two differential equations arising from the generating function of the Catalan numbers which are `inverses' to each other in some sense. From these differential equations, we obtain some new and explicit…

Number Theory · Mathematics 2016-05-20 Taekyun Kim , Dae San Kim

In this paper, we will develop a significantly more general notion of classical Ramsey numbers (extending most other graph-theoretic generalizations) and make some preliminary characterizations of these new Ramsey numbers using simple…

Combinatorics · Mathematics 2025-02-07 Bryce Alan Christopherson

A famous problem posed by Diophantus was to find sets of distinct positive rational numbers such that the product of any two is one less than a rational square. Some sets of six such numbers are presented and the computational algorithm…

Number Theory · Mathematics 2007-05-23 Philip Gibbs

We develop new aspects of the the of numerosity theory; more exactly, we emphasize its relation with the ordinal numbers, cardinal numbers, hyperreal numbers and surreal numbers. In particular, we combine the notion of numerosity with the…

Analysis of PDEs · Mathematics 2025-11-05 Vieri Benci

We derive new infinite series involving Fibonacci numbers and Riemann zeta numbers. The calculations are facilitated by evaluating linear combinations of polygamma functions of the same order at certain arguments.

Number Theory · Mathematics 2021-03-18 Kunle Adegoke , Sourangshu Ghosh

Let $[\, x\,]$ denote the integer part of a real number $x$. Assume that $\lambda_1,\lambda_2,\lambda_3$ are nonzero real numbers, not all of the same sign, that $\lambda_1/\lambda_2$ is irrational, and that $\eta$ is real. Let…

Number Theory · Mathematics 2026-03-25 S. I. Dimitrov

We present a different combinatorial interpretations of Lucas and Gibonacci numbers. Using these interpretations we prove several new identities, and simplify the proofs of several known identities. Some open problems are discussed towards…

Combinatorics · Mathematics 2020-08-12 Pankaj Jyoti Mahanta , Manjil P. Saikia

In this note, I develop step-by-step proofs of irrationality for $\,\zeta{(2)}\,$ and $\,\zeta{(3)}$. Though the proofs follow closely those based upon unit-square integrals proposed originally by Beukers, I introduce some modifications…

Number Theory · Mathematics 2026-04-10 F. M. S. Lima

An isomorphism between two hermitian unitals is proved, and used to treat isomorphisms of classical groups that are related to the isomorphism between certain simple real Lie algebras of types A and D (and rank 3).

Group Theory · Mathematics 2023-04-19 Markus Johannes Stroppel

We explore a novel link between two seemingly disparate mathematical concepts: Egyptian fractions and fractals. By examining the decomposition of rationals into sums of distinct unit fractions, a practice rooted in ancient Egyptian…

Number Theory · Mathematics 2024-12-16 Laura De Carli , Andrew Echezabal , Ismael Morell

In two previous papers we have presented partition formulae for the Fibonacci numbers motivated by the appearance of the Fibonacci numbers in the representation theory of the 3-Kronecker quiver and its universal cover, the 3-regular tree.…

Combinatorics · Mathematics 2011-09-14 Philipp Fahr , Claus Michael Ringel

The main result of this paper, is the complete parametric description of the family of triangles which have integer sidelengths and with one angle being sixty degrees.

General Mathematics · Mathematics 2008-03-27 Konstantine Zelator

There is a natural way to associate with a transformation of an isotopy class of rational tangles to another, an element of the modular group. The correspondence between the isotopy classes of rational tangles and rational numbers follows,…

Geometric Topology · Mathematics 2009-08-18 Francesca Aicardi

We give an infinite number of proofs of Pythagoras theorem.Some can be classified as `self-similar proofs'.

History and Overview · Mathematics 2025-09-04 Gaurav Bhatnagar , Sagar Shrivastava

The existence of infinitely many consecutive prime triples $p_n$, $ p_{n+1}$, and $p_{n+2}$ as $n \to \infty$, is sufficient to prove that the Catalan constant $\beta(2)=0.9159655941\ldots $ is an irrational number. This note provides the…

General Mathematics · Mathematics 2022-07-29 N. A. Carella

The main purpose of this paper is to prove that the positive real numbers can be decomposed into finitely many disjoint pieces which are also closed under addition and multiplication. As a byproduct of the argument we determine all the…

Number Theory · Mathematics 2023-03-30 Gergely Kiss , Gábor Somlai , Tamás Terpai

We give a variety of magic hexagons of Orders from 3 to 7, many of which are extensions of known results. We also give a theorem that their are an infinite number of magic hexagons of Order $n$ for any fixed positive integer $n$ for any…

General Mathematics · Mathematics 2025-08-18 Geoffrey B. Campbell

We introduce a linear algebraic object called a bidiagonal triad. A bidiagonal triad is a modification of the previously studied and similarly defined concept of bidiagonal triple. A bidiagonal triad and a bidiagonal triple both consist of…

Representation Theory · Mathematics 2021-07-15 Darren Funk-Neubauer