Definition:Topological Manifold with Boundary/Boundary
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Definition
Let $M$ be a $n$-dimensional topological manifold with boundary.
The boundary of $M$,
denoted $\partial M$,
is the set of all its
boundary points.
Sources
- 2013: John M. Lee: Introduction to Smooth Manifolds (2nd ed.): Chapter $1$: Smooth Manifolds: $\S$ Manifolds with Boundary