Geometric topology

A Seifert surface bounded by a set of Borromean rings. Seifert surfaces for links are a useful tool in geometric topology.

In mathematics, geometric topology is the study of manifolds and maps between them, particularly embeddings of one manifold into another.

History

Geometric topology as an area distinct from algebraic topology may be said to have originated in the 1935 classification of lens spaces by Reidemeister torsion, which required distinguishing spaces that are homotopy equivalent but not homeomorphic. This was the origin of simple homotopy theory.