Question

Asked Sep 18, 2019

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Step 1

To prove that the boundary of a n-manifold is a (n-1) manifold without boundary

Step 2

As the question is purely local , we may take the n-manifold M to be the closed unit disk in R^n.

Step 3

The unit sphere is a manifold (without boundary): we can use the atlas provided by the two open sets after removing t...

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