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Semi-locally simply connected — In mathematics, in particular topology, a topological space X is called semi locally simply connected if every point x in X has a neighborhood U such that the homomorphism from the fundamental group of U to the fundamental group of X , induced by … Wikipedia
Loop theorem — In the topology of 3 manifolds, the loop theorem is a generalization of Dehn s lemma. The loop theorem was first proven by Christos Papakyriakopoulos in 1956, along with Dehn s lemma and the sphere theorem.A simple and useful version of the loop… … Wikipedia
Toda bracket — In mathematics, the Toda bracket is an operation on homotopy classes of maps, in particular on homotopy groups of spheres, named after Hiroshi Toda who defined them and used them to compute homotopy groups of spheres in… … Wikipedia
