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Top posts (138) All Questions Answers | Votes Newest

43 Are the rationals homeomorphic to any power of the rationals? May 26 '10
25 Which spaces are inverse limits of discrete spaces ? Feb 16 '10
25 Collatz conjecture for numbers of th form $2^n +1$ Jan 4 '11
21 Tetrahedra with prescribed face angles Feb 24 '10
19 Proving that a group is free Mar 16 '10
19 Example of an unnatural isomorphism Aug 14 '13
18 When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group? Feb 1 '11
16 Outer automorphisms of finite extensions Apr 15 '11
16 The free group $F_2$ has index 12 in SL(2,$\mathbb{Z}$) Oct 26 '10
15 Automorphisms of $SL_n(\mathbb{Z})$ Mar 3 '11
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