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Magic squares are well-known arrangements of integers with common row, column, and diagonal sums. Various other magic shapes have been proposed, but triangles have been somewhat overlooked. We introduce certain triangular arrangements of…

General Mathematics · Mathematics 2022-08-29 Gabriel Hale , Bjorn Vogen , Matthew Wright

Astrophysical paradoxes are the paradoxes of physics. The main motivation of a formulated paradox is clearly recognized in the scientific environment because the phenomenon of a paradox itself has become interesting. There is an explanation…

History and Philosophy of Physics · Physics 2008-12-10 Dragoljub A. Cucic

We present an analysis of a coin-tossing problem posed by Daniel Litt which has generated some popular interest. We demonstrate a recursive identity which leads to relatively simple formulas for the excess number of wins for one player over…

Combinatorics · Mathematics 2025-12-09 Bruce Levin

McCammond and Wise have introduced the perimeter of 2-complexes, and they have used it to obtain a sufficient criterion for coherence. We present a new exposition of their main result, as well as some applications.

Group Theory · Mathematics 2014-11-18 Peter Brinkmann

A family of congruences interpolating between those of Wilson and Giuga is constructed. Several elementary results are established, in order to present a possible approach to establishing Giuga's conjecture.

Number Theory · Mathematics 2020-03-20 Thomas Sauvaget

An introduction and survey of homotopy type theory in honor of W.W. Tait.

Logic · Mathematics 2023-03-31 Steve Awodey

Jigsaw puzzle solving is an intriguing problem which has been explored in computer vision for decades. This paper focuses on a specific variant of the problem - solving puzzles with eroded boundaries. Such erosion makes the problem…

Image and Video Processing · Electrical Eng. & Systems 2019-12-03 Dov Bridger , Dov Danon , Ayellet Tal

We survey the state of the union-closed sets conjecture.

Combinatorics · Mathematics 2013-10-31 Henning Bruhn , Oliver Schaudt

General methods for the construction of magic squares of any order have been searched for centuries. There have been several standard strategies for this purpose, such as the knight movement, or the construction of bordered magic squares,…

Combinatorics · Mathematics 2007-05-23 Eduardo Saenz de Cabezon

Stanley introduces polynomials which help evaluate symmetric group characters and conjectures that the coefficients of the polynomials are positive. Stanley later gives a conjectured combinatorial interpretation for the coefficients of the…

Combinatorics · Mathematics 2007-12-21 Amarpreet Rattan

In 1693, Isaac Newton answered a query from Samuel Pepys about a problem involving dice. Newton's analysis is discussed and attention is drawn to an error he made.

Statistics Theory · Mathematics 2007-06-13 Stephen M. Stigler

A conjecture is given that, if true, could lead to an algorithm for computing definite sums of rational functions.

Combinatorics · Mathematics 2007-05-23 Mark van Hoeij

Although expected utility theory has proven a fruitful and elegant theory in the finite realm, attempts to generalize it to infinite values have resulted in many paradoxes. In this paper, we argue that the use of John Conway's surreal…

Artificial Intelligence · Computer Science 2021-11-02 Eddy Keming Chen , Daniel Rubio

The article attempts to demonstrate the rich history of one truly remarkable problem situated at the confluence of probability theory and theory of numbers - finding the probability of co-primality of two randomly selected natural numbers.…

History and Overview · Mathematics 2017-04-12 Sergei Abramovich , Yakov Yu. Nikitin

In this paper, we give a simple counter example to the famous Hodge conjecture.

General Mathematics · Mathematics 2013-01-23 Renyi Ma

Conceptors provide an elementary neuro-computational mechanism which sheds a fresh and unifying light on a diversity of cognitive phenomena. A number of demanding learning and processing tasks can be solved with unprecedented ease,…

Neural and Evolutionary Computing · Computer Science 2014-06-11 Herbert Jaeger

We study the geometry and topology of immersed surfaces in Euclidean 3-space whose Gauss map satisfies a certain two-piece-property, and solve the ``shadow problem" formulated by H. Wente.

Differential Geometry · Mathematics 2007-05-23 Mohammad Ghomi

We explore an (unpublished) approach to the famous Jacobian Conjecture by means of identities of algebras, discovered by the brilliant deceased mathematician, Alexander Vladimirovich Yagzhev (1951{2001). This approach also indicates some…

Algebraic Geometry · Mathematics 2019-12-03 Alexei Belov , Leonid Bokut , Louis Rowen , Jie-Tai Yu

We give an identity which is conjectured and proved by using an implementation in Multi-WZ.

Combinatorics · Mathematics 2007-05-23 Akalu Tefera

By some new recursive algorithms, in this paper, we will give some improvements on Waring's problem.

Combinatorics · Mathematics 2020-02-11 An-Ping Li