Cobordism
(N+1)-MANIFOLD W LINKING TWO N-MANIFOLDS M AND N, WITH BOUNDARY OF W CONSISTING OF M AND N
Bordism; Cobordism theory; Cobordant; Cobordism class; Oriented cobordism ring; Oriented cobordism; Oriented cobordant
In mathematics, cobordism is a fundamental equivalence relation on the class of compact manifolds of the same dimension, set up using the concept of the boundary (French [giving cobordism) of a manifold. Two manifolds of the same dimension are cobordant if their disjoint union] is the boundary of a compact manifold one dimension higher.