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Everyone knows that the Euler characteristic of a combinatorial manifold is given by the alternating sum of its numbers of simplices. It is shown that there are other linear combinations of the numbers of simplices which are combinatorial…

Geometric Topology · Mathematics 2007-05-23 Justin Roberts

In this short note, we provide an elementary complex analytic method for converting known real integrals into numerous strange and interesting looking real integrals.

History and Overview · Mathematics 2009-11-05 Josh Isralowitz

Natural numbers satisfying an unusual property are mentioned by the author in [5], in which their infinitude is also proved. In this paper, we start with an arbitrary natural number which is not a multiple of 10 and non-palindromic, form…

Number Theory · Mathematics 2020-12-04 Daniel Tsai

The unique and beautiful character of certain mathematical results and proofs is often considered one of the most gratifying aspects of engaging with mathematics. We study whether this perception of mathematical arguments having an…

History and Overview · Mathematics 2017-11-23 Samuel G. B. Johnson , Stefan Steinerberger

This work delves into the {\it quotient of an affine semigroup by a positive integer}, exploring its intricate properties and broader implications. We unveil an {\it associated tree} that serves as a valuable tool for further analysis.…

Commutative Algebra · Mathematics 2024-02-20 J. I. García-García , R. Tapia-Ramos , A. Vigneron-Tenorio

The notion of multidimensional quadrilateral lattice is introduced. It is shown that such a lattice is characterized by a system of integrable discrete nonlinear equations. Different useful formulations of the system are given. The…

solv-int · Physics 2009-10-30 A. Doliwa , P. M. Santini

Order unit property of a positive element in a $C^{*}$-algebra is defined. It is proved that precisely projections satisfy this order theoretic property. This way, unital hereditary $C^{*}$-subalgebras of a $C^{*}$-algebra are…

Operator Algebras · Mathematics 2007-05-23 Anil K. Karn

We give some theoretical and computational results on "random" harmonic sums with prime numbers, and more generally, for integers with a fixed number of prime factors.

Number Theory · Mathematics 2020-12-08 Alessandro Gambini , Remis Tonon , Alessandro Zaccagnini

This article describes some aspects of Cauchy integrals and related geometry of sets and measures in Euclidean spaces, etc.

Classical Analysis and ODEs · Mathematics 2007-05-23 Stephen Semmes

One presents many Concatenated and Operation Sequences, P-Q Relationships, Digital Sequences, Magic Squares, Prime Conjectures, k-Divisibility and Strong Divisibility Sequences, Geometric Conjectures, Proposed problems.

General Mathematics · Mathematics 2007-05-23 Florentin Smarandache

In this chapter, a statistical measure of complexity is introduced and some of its properties are discussed. Also, some straightforward applications are shown.

Adaptation and Self-Organizing Systems · Physics 2010-09-09 Ricardo Lopez-Ruiz , Hector Mancini , Xavier Calbet

Some formulas and speculations are presented relative to integrable systems and quantum mechanics.

High Energy Physics - Theory · Physics 2007-05-23 Robert Carroll

A somewhat pretentious presentation of number systems (N, Z, Q, R, C, Q_p, >...). The problem of a p-adic characterisation of good-reduction p-adic curves is posed.

History and Overview · Mathematics 2007-05-23 Chandan Singh Dalawat

We characterize all coexistent pairs of qubit effects. This gives an exhaustive description of all pairs of events allowed, in principle, to occur in a single qubit measurement. The characterization consists of three disjoint conditions…

Quantum Physics · Physics 2008-07-15 Peter Stano , Daniel Reitzner , Teiko Heinosaari

Properties of the recently reported homogeneous Hilbert curves are deduced and reported. The nature of the affine transformations involved in the construction of the Hilbert curves is explored. The analytical representation of proper and…

Algebraic Geometry · Mathematics 2013-11-13 E. Estevez-Rams , I. Brito-Reyes

We consider indecomposable representations of the Klein four group over a field of characteristic $2$ and of a cyclic group of order $pm$ with $p,m$ coprime over a field of characteristic $p$. For each representation we explicitly describe…

Commutative Algebra · Mathematics 2016-01-26 Martin Kohls , Mufit Sezer

Our aim in this note is to present four remarkable facts about quotient sets. These observations seem to have been overlooked by the Monthly, despite its intense coverage of quotient sets over the years.

Number Theory · Mathematics 2013-12-05 Bryan Brown , Michael Dairyko , Stephan Ramon Garcia , Bob Lutz , Michael Someck

A new integral representation is derived using a definite integral given by Cauchy and used to evaluate a number of integrals containing the finite series of special functions.

General Mathematics · Mathematics 2024-08-27 Robert Reynolds

We investigate combinatorial properties of a kind of insets we defined in an earlier paper, interpreting them now in terms of restricted ternary words. This allows us to give new combinatorial interpretations of a number of known integer…

Combinatorics · Mathematics 2019-05-14 Milan Janjic

The causal set theory d'Alembertian has rational coefficients for which alternating expressions are known. Here, a combinatorial interpretation of these numbers is given.

Combinatorics · Mathematics 2025-03-21 Karen Yeats