Earthling

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25 Questions

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8	Non-orientable 3-manifold has infinite fundamental group
6	Structures on torus
5	Determine topological properties of a space of matrices
5	Nilpotent Lie group homeomorphic to $\mathbb R^n$?
4	Why are the integers appearing in lens spaces coprime?

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470 Reputation

+5	Weight spaces of Verma modules
+5	Radical of $\mathfrak{gl}_n$
+10	Non-orientable 3-manifold has infinite fundamental group
+5	Why are the integers appearing in lens spaces coprime?

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3 Answers

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2	Find $\dim R(T)$ and $\dim N(T)$ from the matrix of a linear map $T$
1	Prove all neighbourhoods are open in this topology
0	Group action on a manifold with finitely many orbits

29 Tags

2 matrices × 7	0 lie-algebras × 5
2 linear-algebra × 3	0 algebraic-topology × 4
2 vector-spaces	0 lie-groups × 4
1 general-topology × 5	0 homotopy-theory × 3
0 group-theory × 5	0 reference-request × 2

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