e/Homology sphere

Information
has gloss	eng: In algebraic topology, a homology sphere is an n-manifold X having the homology groups of an n-sphere, for some integer n ≥ 1. That is,
lexicalization	eng: homology sphere
instance of	(noun) (mathematics) any set of points that satisfy a set of postulates of some kind; "assume that the topological space is finite dimensional" mathematical space, topological space