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Results tagged with at.algebraic-topology
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user 1570
Homotopy theory, homological algebra, algebraic treatments of manifolds.
66
votes
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answers
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What are the open subsets of $\mathbb{R}^n$ that are diffeomorphic to $\mathbb{R}^n$
I would like to know if there is a known necessary and sufficient
property on an open subset of $\mathbb{R}^n$ to be diffeomorphic to $\mathbb{R}^n$ :
For example :
Are all open star-shaped subsets o …
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