superperfect
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Superperfect number — In mathematics a superperfect number is a positive integer n that satisfies:sigma^2(n)=sigma(sigma(n))=2n, ,where σ is the divisor function. Superperfect numbers are a generalisation of perfect numbers.The first few superperfect numbers are:2, 4 … Wikipedia
Superperfect group — In mathematics, in the realm of group theory, a group is said to be superperfect when its first two homology groups are trivial.The first homology group of a group is the abelianization of the group itself, since the homology of a group G is the… … Wikipedia
superperfect — adj.; superperfectly, adv … Useful english dictionary
Covering groups of the alternating and symmetric groups — In the mathematical area of group theory, the covering groups of the alternating and symmetric groups are groups that are used to understand the projective representations of the alternating and symmetric groups. The covering groups were… … 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
Schur multiplier — In mathematical group theory, the Schur multiplier or Schur multiplicator is the second homology group of a group G. It was introduced by Issai Schur (1904) in his work on projective representations. Contents 1 Examples and properties 2 Re … Wikipedia
List of mathematics articles (S) — NOTOC S S duality S matrix S plane S transform S unit S.O.S. Mathematics SA subgroup Saccheri quadrilateral Sacks spiral Sacred geometry Saddle node bifurcation Saddle point Saddle surface Sadleirian Professor of Pure Mathematics Safe prime Safe… … Wikipedia
65536 (number) — Number number= 65536 range = 10000 100000 cardinal = sixty five thousand five hundred thirty six ordinal = th numeral = factorization = 2^{16} prime = divisor = 17 roman = unicode = greek prefix = latin prefix = bin = 10000000000000000 oct = duo … Wikipedia
Semi-s-cobordism — In mathematics, a cobordism ( W , M , M −) of an ( n + 1) dimensionsal manifold (with boundary) W between its boundary components, two n manifolds M and M − (n.b.: the original creator of this topic, Jean Claude Hausmann, used the notation M −… … Wikipedia
Superperfekte Zahl — Eine natürliche Zahl n wird als superperfekte Zahl bezeichnet, wenn die Summe der Teiler der Summe ihrer Teiler doppelt so groß ist wie die ursprüngliche Zahl n. Verwendet man als Notation für die Teilersummenfunktion, so kann man die Definition… … Deutsch Wikipedia
