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Template:Manifold eqrel
Tw manifolds M {\displaystyle M} and N {\displaystyle N} of the same dimension n {\displaystyle n} , are said to be cobordant if there is a manifold of dimension n + 1 {\displaystyle n+1} whose boundary is the disjoint union of M {\displaystyle M} with N {\displaystyle N} .
