erds
31Robertsman — Roberdsman Rob erds*man, Robertsman Rob erts*man, n.; pl. { men}. (Old Statutes of Eng.) A bold, stout robber, or night thief; said to be so called from Robin Hood. [1913 Webster] …
32Carmichael number — In number theory, a Carmichael number is a composite positive integer n which satisfies the congruence b^{n 1} equiv 1 pmod{n} for all integers b which are relatively prime to n (see modular arithmetic). They are named for Robert Carmichael. The… …
33Erdős number — The Erdős number (IPA2|ɛrdøːʃ), honoring the late Hungarian mathematician Paul Erdős, is a way of describing the collaborative distance between a person and Erdős, as measured by authorship of mathematical papers.It was created by friends as a… …
34Proof of Bertrand's postulate — In mathematics, Bertrand s postulate (actually a theorem) states that for each n ≥ 2 there is a prime p such that n < p < 2 n . It was first proven by Pafnuty Chebyshev, and a short but advanced proof was given by Srinivasa Ramanujan. The gist of …
35Labor Management Reporting and Disclosure Act — The Labor Management Reporting and Disclosure Act (or LMRDA), also known as the Landrum Griffin Act (for its sponsors, Democrat Phil Landrum and Republican Robert P. Griffin), is a United States labor law that regulates labor unions internal… …
36Geombinatorics — is a mathematical research journal (ISSN|1065 7371) published by the University of Colorado, USA, since 1991 under an international board of editors. It is devoted to problems in discrete, convex and combinatorial geometry, and related… …
37Kollagunta Gopalaiyer Ramanathan — (November 13, 1920 May 10, 1992) was a front rank Indian mathematician of international reputation with distinguished and well recognized achievements in number theory. He had contributed in no small measure to the emergence of a new generation… …
38Powerful number — A powerful number is a positive integer m that for every prime number p dividing m , p 2 also divides m . Equivalently, a powerful number is the product of a square and a cube, that is, a number m of the form m = a 2 b 3, where a and b are… …
39Entity-relationship model — A sample Entity relationship diagram using Chen s notation In software engineering, an entity relationship model (ERM) is an abstract and conceptual representation of data. Entity relationship modeling is a database modeling method, used to… …
40Superabundant number — In mathematics, a superabundant number (sometimes abbreviated as SA) is a certain kind of natural number. Formally, a natural number n is called superabundant precisely when, for any m lt; n ,:frac{sigma(m)}{m} < frac{sigma(n)}{n}where σ denotes… …
