Definition:Cobordism/Oriented
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Definitions
Let $X^n$ and $Y^n$ be orientable manifolds without boundary of dimension $n$.
An oriented cobordism $W^{n + 1}$ is an $\paren {n + 1}$-dimensional topological manifold such that:
- $\partial W = X \cup \overline Y$
where:
- $\partial W$ denotes the boundary of $W$
- $\overline Y$ denotes $Y$ taken with reverse orientation.