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As far as algebraic properties are concerned, the usual addition on the class of ordinal numbers is not really well behaved; for example, it is not commutative, nor left cancellative etc. In a few cases, the natural Hessemberg sum is a…

Logic · Mathematics 2017-02-28 Paolo Lipparini

We study a transfinite iteration of the ordinal Hessenberg natural sum obtained by taking suprema at limit stages and show that such an iterated natural sum differs from the more usual transfinite ordinal sum only for a finite number of…

Logic · Mathematics 2019-01-17 Paolo Lipparini

In this article the infinite product of bicomplex numbers is defined and the convergence and divergence of this product are discussed.

Complex Variables · Mathematics 2017-06-26 Chinmay Ghosh

We prove that the distribution of the product of two correlated normal random variables with arbitrary means and arbitrary variances is infinitely divisible. We also obtain exact formulas for the probability density function of the sum of…

Probability · Mathematics 2025-06-10 Robert E. Gaunt , Saralees Nadarajah , Tibor K. Pogány

We provide a pure algebraic version of the dynamical characterization of Conrad's property. This approach allows dealing with general group actions on totally ordered spaces. As an application, we give a new and somehow constructive proof…

Group Theory · Mathematics 2014-10-01 Adam Clay , Andrés Navas , Cristóbal Rivas

We motivate and study an infinite sequence of binary operations on the ordinal numbers, extending the standard arithmetic on the ordinals to higher degrees of iteration. Connections to the hyperoperations on the natural numbers are…

Logic · Mathematics 2025-08-26 Adrian Ducourtial

We study several integrals that contain the infinite product ${\displaystyle\prod_{n=0}^\infty}\left[1+\left(\frac{x}{b+n}\right)^3\right]$ in the denominator of their integrand. These considerations lead to closed form evaluation…

Classical Analysis and ODEs · Mathematics 2017-12-21 Martin Nicholson

In this note we describe a new method of counting the number of unordered factorizations of a natural number by means of a generating function and a recurrence relation arising from it, which improves an earlier result in this direction.

Discrete Mathematics · Computer Science 2008-11-24 Shamik Ghosh

In a constructive setting, no concrete formulation of ordinal numbers can simultaneously have all the properties one might be interested in; for example, being able to calculate limits of sequences is constructively incompatible with…

Logic in Computer Science · Computer Science 2023-05-18 Nicolai Kraus , Fredrik Nordvall Forsberg , Chuangjie Xu

We introduce a non-wellfounded proof system for intuitionistic logic extended with inductive and co-inductive definitions, based on a syntax in which fixpoint formulas are annotated with explicit variables for ordinals. We explore the…

Logic in Computer Science · Computer Science 2026-05-13 Sebastian Enqvist

Cantor's ordinal numbers, a powerful extension of the natural numbers, are a cornerstone of set theory. They can be used to reason about the termination of processes, prove the consistency of logical systems, and justify some of the core…

Logic in Computer Science · Computer Science 2025-10-22 Tom de Jong , Nicolai Kraus , Fredrik Nordvall Forsberg , Chuangjie Xu

The usual nonnegative modulus function is based on addition. A natural different modulus function on the set of positive reals is introduced. Arguments for results for series through the usual modulus function are transformed to arguments…

General Mathematics · Mathematics 2019-12-10 C. Ganesa Moorthy

In this article we propose a general method of obtaining infinite sums of products with functions that count patterns in numbers.

Number Theory · Mathematics 2015-10-12 Yining Hu

A causal set is a partially ordered set on a countably infinite ground-set such that each element is above finitely many others. A natural extension of a causal set is an enumeration of its elements which respects the order. We bring…

Probability · Mathematics 2011-09-22 Graham Brightwell , Malwina Luczak

We give an exact coefficients formula of any infinite product of power series with constant term equal to $1$, by using structures from partitions of integers and permutation groups. This is an universal theorem for various of Binomial-type…

Combinatorics · Mathematics 2024-11-05 Kui-Yo Chen , Zhong-Tang Wu

A product of compact normal spaces is normal; the product of a countably infinite collection of non-trivial spaces is normal if and only if it is countably paracompact and each of its finite sub-products is normal; if all powers of a space…

General Topology · Mathematics 2020-02-10 N. Noble

A construction of product measures is given for an arbitrary sequence of measure spaces via outer measure techniques without imposing any condition on the underlying measure spaces. This approach concludes finally the problem of the…

Functional Analysis · Mathematics 2024-11-08 Juan Carlos Sampedro

We study some infinite products of absolute zeta functions. Especially, we consider the convergence and the rationality of them.

Number Theory · Mathematics 2021-06-18 Nobushige Kurokawa , Hidekazu Tanaka

Cantor's famous proof of the non-denumerability of real numbers does apply to any infinite set. The set of exclusively all natural numbers does not exist. This shows that the concept of countability is not well defined. There remains no…

General Mathematics · Mathematics 2009-09-29 W. Mueckenheim

We generalize the lexicographic product of first-order structures by presenting a framework for constructions which, in a sense, mimic iterating the lexicographic product infinitely and not necessarily countably many times. We then define…

Logic · Mathematics 2023-08-09 Nadav Meir
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