In differential topology, an area of mathematics, a neat submanifold of a manifold with boundary is a kind of "well-behaved" submanifold. More precisely, let be a manifold with boundary, and a submanifold of . A is said to be a neat submanifold of if it meets the following two conditions:
- The boundary of the submanifold coincides with the parts of the submanifold that are part of the boundary of the larger manifold. That is, .
- Each point of the submanifold has a neighborhood within which the submanifold's embedding is equivalent to the embedding of a hyperplane in a higher-dimensional Euclidean space. More formally, must be covered by charts of such that where is the dimension of . For instance, in the category of smooth manifolds, this means that the embedding of must also be smooth.
- Lee, Kotik K. (1992), Lectures on Dynamical Systems, Structural Stability, and Their Applications, World Scientific, p. 109, ISBN 9789971509651.
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