fibered action
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Grothendieck topology — In category theory, a branch of mathematics, a Grothendieck topology is a structure on a category C which makes the objects of C act like the open sets of a topological space. A category together with a choice of Grothendieck topology is called a … Wikipedia
Algebraic stack — In algebraic geometry, an algebraic stack is a concept introduced to generalize algebraic varieties, schemes, and algebraic spaces. They were originally proposed in a 1969 paper[1] by Pierre Deligne and David Mumford to define the (fine) moduli… … Wikipedia
Orbifold — This terminology should not be blamed on me. It was obtained by a democratic process in my course of 1976 77. An orbifold is something with many folds; unfortunately, the word “manifold” already has a different definition. I tried “foldamani”,… … Wikipedia
Bass–Serre theory — is a part of the mathematical subject of group theory that deals with analyzing the algebraic structure of groups acting by automorphisms on simplicial trees. The theory relates group actions on trees with decomposing groups as iterated… … Wikipedia
Nielsen-Thurston classification — In mathematics, Thurston s classification theorem characterizes homeomorphisms of a compact surface. William Thurston s theorem completes the work initiated by Jakob Nielsen in the 1930s.Given a homeomorphism f : S rarr; S , there is a map g… … Wikipedia
Nielsen–Thurston classification — In mathematics, Thurston s classification theorem characterizes homeomorphisms of a compact surface. William Thurston s theorem completes the work initiated by Jakob Nielsen (1944). Given a homeomorphism f : S → S, there… … Wikipedia
Symplectic cut — In mathematics, specifically in symplectic geometry, the symplectic cut is a geometric modification on symplectic manifolds. Its effect is to decompose a given manifold into two pieces. There is an inverse operation, the symplectic sum, that… … Wikipedia
Rips machine — In geometric group theory, the Rips machine is a method of studying the action of groups on R trees. It was introduced in unpublished work of Eliyahu Rips in about 1991. An R tree is a uniquely arcwise connected metric space in which every arc is … Wikipedia
HISTORY — For Prehistory see archaeology ; for Biblical and Second Temple periods, see history . Destruction of the Second Temple until the Arab Conquest (70–640 C.E.) THE EFFECTS OF THE WAR OF 66–70 C.E. The Jewish war against the Romans, which lasted… … Encyclopedia of Judaism
Vector bundle — The Möbius strip is a line bundle over the 1 sphere S1. Locally around every point in S1, it looks like U × R, but the total bundle is different from S1 × R (which is a cylinder instead). In mathematics, a vector bundle is a… … Wikipedia
Yonatan Netanyahu — Yonatan Yoni Netanyahu Nickname Yoni B … Wikipedia
