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HJRW
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49
Most interesting mathematics mistake?
Dec 15, 2009
43
What are some of the big open problems in 3-manifold theory?
Aug 22, 2010
39
finite generated group realized as fundamental group of manifolds
Feb 16, 2010
38
What are your favorite instructional counterexamples?
Mar 2, 2010
33
Can a connected planar compactum minus a point be totally disconnected?
Feb 27, 2010
29
Can a group be a universal Turing machine?
Feb 14, 2012
27
Mapping from a finite index subgroup onto the whole group
Mar 2, 2012
27
Does injectivity of $\pi_1(\partial U) \to \pi_1(M)$ imply injectivity of $\pi_1(U) \to \pi_1(M)$?
Oct 18, 2019
25
Fundamental group of 3-manifold with boundary
Nov 19, 2009
25
Primes occurring as orders of elements of a finitely presented group
Feb 8, 2013

Top network posts

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77
$|G|>2$ implies $G$ has non trivial automorphism
45
subgroups of finitely generated groups with a finite index
31
Finding subgroups of a free group with a specific index
15
A space of ideals
9
Epimorphism from GL(2,Z) to GL(2,Z)