Number — For other uses, see Numbers (disambiguation). A number is a mathematical object used to count and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational… … Wikipedia
Perfect number — In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum). Equivalently, a perfect… … Wikipedia
Harmonic divisor number — This article is about harmonic divisor numbers. For meanings of harmonic number, see harmonic number (disambiguation). In mathematics, a harmonic divisor number, or Ore number (named after Øystein Ore who defined it in 1948), is a positive… … Wikipedia
8000 (number) — 8000 (eight thousand) is the natural number following 7999 and preceding 8001.8000 is the cube of 20, as well as the sum of four consecutive integers cubed, 113 + 123 + 133 + 143.The fourteen tallest mountains on Earth, which exceed 8000 meters… … Wikipedia
Hyperperfect number — In mathematics, a k hyperperfect number (sometimes just called hyperperfect number ) is a natural number n for which the equality n = 1 + k ( σ ( n ) − n − 1) holds, where σ ( n ) is the divisor function (i.e., the sum of all positive divisors of … Wikipedia
127 (number) — ← 126 128 → 127 ← 120 121 122 123 124 125 126 … Wikipedia
Mosaics — • Includes information on the history and techniques Catholic Encyclopedia. Kevin Knight. 2006. Mosaics Mosaics † … Catholic encyclopedia
Local Partnerships — England, Wales a joint venture between the Local Government Association (LGA) and Partnerships UK (PUK). Local Partnerships is owned equally by the LGA and PUK and, from 16 August 2009, delivers all the local government services previously… … Law dictionary
List of mathematics articles (0-9) — NOTOC 0 −0 (number) −1 (number) −40 (number) Σ compact space Ω consistent theory Γ convergence Δ hyperbolic space Ω logic Ε net Ε quadratic form Μ recursive function yllion 0 (number) Ε₀ 0,1 simple lattice 0.999... ( 2, 3, 7) pretzel knot (2,3,7) … Wikipedia
Donald Thomas — For other people named Donald Thomas, see Donald Thomas (disambiguation). Donald Serrell Thomas (born 1926[1][2]) is an English author of (primarily) Victorian era historical, crime and detective fiction, as well as books on factual crime and… … Wikipedia
