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Cosine
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18
Is the minimal volume a topological invariant?
11
A topological tree is weakly contractible
6
When can we find a net, defined on a totally ordered index set, converging to a non-isolated point in a compact Hausdorff space?
5
Given a totally ordered system of Banach spaces, can we we always change the norms to get isometric embeddings?
5
If two matrices have same characteristic polynomial, then if square root for one exists, it also exists for the other one.

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