Cobordism

（重定向自Cobordism theory）

A cobordism between a single circle (at the top) and a pair of disjoint circles (at the bottom).

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 bord, 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.

单词	Cobordism theory
释义	Cobordism theory 英语百科 Cobordism （重定向自Cobordism theory） 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 bord, 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.
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