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43 Are the rationals homeomorphic to any power of the rationals? May 26 '10
28 Collatz conjecture for numbers of th form $2^n +1$ Jan 4 '11
27 Which spaces are inverse limits of discrete spaces ? Feb 16 '10
21 Tetrahedra with prescribed face angles Feb 24 '10
19 When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group? Feb 1 '11
19 Proving that a group is free Mar 16 '10
19 Example of an unnatural isomorphism Aug 14 '13
17 Is a inverse limit of compact spaces again compact ? Mar 18 '10
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
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