alephzero314

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7 Questions

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12	A five-part problem that uses ends and the Cantor set to prove that there are $c$ non-homeomorphic connected open subsets of $\mathbb{R}^2$
7	Comb space has no simply connected cover
5	Finding the fundamental group of the complement of a certain graph
5	A homotopy equivalence between spaces $B\Gamma$ and $K\Gamma$ for a graph of groups on a graph $\Gamma$
4	Separating points in the plane by a compact set that is not allowed to intersect a given set A

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254 Reputation

+5	Finding the fundamental group of the complement of a certain graph
+10	Closed form for a sum involving binomial coefficients
+5	Comb space has no simply connected cover
+5	A five-part problem that uses ends and the Cantor set to prove that there are $c$ non-homeomorphic connected open subsets of $\mathbb{R}^2$

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3 Answers

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6	Closed form for a sum involving binomial coefficients
3	Arbitrary intersection of closed, connected subsets of a compact space connected?
0	Comb space has no simply connected cover

4 Tags

6 combinatorics	3 general-topology × 7
6 binomial-coefficients	0 algebraic-topology × 5

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