Cobordism
= Cobordism
{wiki}
A cobordism from a closed oriented $n$-manifold $X_0$ to $X_1$ is a compact oriented $(n+1)$-manifold $W$ whose oriented boundary is $-X_0\sqcup X_1$.
= Cobordism
{wiki}
A cobordism from a closed oriented $n$-manifold $X_0$ to $X_1$ is a compact oriented $(n+1)$-manifold $W$ whose oriented boundary is $-X_0\sqcup X_1$.