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A little general abstract combinatorial nonsense delivered in this note is a presentation of some old and basic concepts, central to discrete mathematics, in terms of new words. The treatment is from a structural and systematic point of…

Category Theory · Mathematics 2007-06-14 Sheng Bau

This note presents an interesting counterexample to a basic covering problem.

Metric Geometry · Mathematics 2014-02-21 Fei Xue , Chuanming Zong

This note is devoted to the construction of a graded Lie algebra, whose grading is not given by a semigroup.

Rings and Algebras · Mathematics 2007-05-23 Alberto Elduque

The purpose of this note is to provide an alternative proof of two quadratic transformation formulas contiguous to that of Gauss using a differential equation approach.

Classical Analysis and ODEs · Mathematics 2014-11-20 M Swathi , A K Rathie , R B Paris

This note presents a rather intuitive approach to extreme value theory. This approach was devised mostly for pedagogical reason.

Statistics Theory · Mathematics 2008-11-06 Philippe Barbe

Here I share a few notes I used in various course lectures, talks, etc. Some may be just calculations that in the textbooks are more complicated, scattered, or less specific; others may be simple observations I found useful or curious.

Discrete Mathematics · Computer Science 2025-06-17 Leonid A. Levin

The aim of this short note is mainly pedagogical. It summarizes some knowledge about Boolean satisfiability (SAT) and the P=NP? problem in an elementary mathematical language. A convenient scheme to visualize and manipulate CNF formulae is…

Computational Complexity · Computer Science 2014-08-15 Bernd R. Schuh

We obtain simple proofs of certain inequalites for bivariate means.

Classical Analysis and ODEs · Mathematics 2011-05-04 Jozsef Sandor

The classical quadratic formula and some of its lesser known variants for solving the quadratic equation are reviewed. Then, a new formula for the roots of a quadratic polynomial is presented.

History and Overview · Mathematics 2019-08-06 Norbert Hungerbühler

We propose a criterion of equidistribution by the differentiability of certain arithmetic invariants. Combined with the slope method and the asymptotic measures, this criterion gives a new "conceptual" proof to equidistribution results…

Algebraic Geometry · Mathematics 2008-12-19 Huayi Chen

The main purpose of this Note is to provide a non-trivial bound on certain Kloosterman sums as considered in the recent paper of E. Fouvry [F], leading to a small improvement of his result on the Pell equation.

Number Theory · Mathematics 2013-11-26 Jean Bourgain

In this paper, we prove that two different observers don't equally measure the distance between two points A and B. For this, we introduce some postulates and obtain a new formula to show distance between A and B. In this formula, radius of…

General Physics · Physics 2007-05-23 M. Akbari , M. T. Darvishi

We give evaluations in closed form of certain non linear differential equations

General Mathematics · Mathematics 2014-04-01 Nikos Bagis

We suggest a new approach to Artin's constant that leads to its representation as an infinite sum divided by another infinite sum. The same approach works well for Stephens' constant and higher rank Artin's constants. The main results are…

Number Theory · Mathematics 2009-03-11 Ivan Cherednik

The question of what should be meant by a measurement is tackled from a mathematical perspective whose physical interpretation is that a measurement is a fundamental process via which a finite amount of classical information is produced.…

Quantum Physics · Physics 2023-01-10 Pedro Resende

The notions of potential infinity (understood as expressing a direction) and actual infinity (expressing a quantity) are investigated. It is shown that the notion of actual infinity is inconsistent, because the set of all (finite) natural…

General Mathematics · Mathematics 2007-05-23 W. Mueckenheim

This note comprises a negative resolution of the Efficient Market Hypothesis.

General Finance · Quantitative Finance 2018-06-04 Robert Viragh

These notes are concerned with the existence and the basic properties of the set-theoretic universes for nonstandard analysis, compiled by a beginner in the subject. It assumes a basic background in first-order logic, though the necessary…

Logic · Mathematics 2025-10-22 Peter Ouwehand

A general method for solving linear differential equations of arbitrary order, is used to arrive at new representations for the solutions of the known differential equations, both without and with a source term. A new quasi-solvable…

Mathematical Physics · Physics 2008-04-24 N. Gurappa , Pankaj K. Jha , Prasanta K. Panigrahi

This technical note provides a high-level overview of the present state of basic field electron emission (FE) theory, as suitable for use in the context of technological applications of FE theory. At present there is much theoretical…

Mesoscale and Nanoscale Physics · Physics 2026-03-18 Richard G. Forbes