homotopy group
121Size functor — Given a size pair (M,f) where M is a manifold of dimensionn and f is an arbitrary real continuous function definedon it, the i th size functor Francesca Cagliari, Massimo Ferri, Paola Pozzi, Size functions from a categorical viewpoint , Acta… …
122Invariant — may have several meanings, among which are:* Invariant (computer science), an expression whose value doesn t change during program execution * In computer science, a type in overriding that is neither covariant nor contravariant * Invariant… …
123Trinification — In physics, the trinification model is a GUT theory. It states that the gauge group is either :SU(3) C imes SU(3) L imes SU(3) R or : [SU(3) C imes SU(3) L imes SU(3) R] /mathbb{Z} 3; and that the fermions form three families, each consisting of… …
124Pi (disambiguation) — Pi, or π is the mathematical constant equal to a circle s circumference divided by its diameter. Pi or PI may also refer to: Contents 1 Letter Pi (π) 2 Pi as a word 3 PI as an abbreviation 3.1 …
125Dold–Thom theorem — In algebraic topology, the Dold–Thom theorem, proved by Albrecht Dold and Thom (1956, 1958), states that the homotopy group πi(SP(X)) of the infinite symmetric product SP(X) of X is the i th singular reduced homology group of X , usually… …
126Novikov's compact leaf theorem — In mathematics, Novikov s compact leaf theorem, named after Sergei Novikov, states that A codimension one foliation of a compact 3 manifold whose universal covering space is not contractible must have a compact leaf. Novikov s compact leaf… …
127Eckmann–Hilton argument — In mathematics, the Eckmann–Hilton argument (or Eckmann–Hilton principle or Eckmann–Hilton theorem) is an argument about two monoid structures on a set where one is a homomorphism for the other. Given this, the structures can be shown to coincide …
128Tadatoshi Akiba — nihongo|Tadatoshi Akiba|秋葉 忠利|Akiba Tadatoshi|extra=born November 3, 1942 in Arakawa, Tokyo is mayor of the city of Hiroshima, Japan.He studied mathematics at the University of Tokyo, receiving a B.S. in 1966 and an M.S. in 1968. He continued his …
