Top network posts

• 27 For $x$ irrational, is $a_{n} =\sum_{k=1}^{n}(-1)^{⌊kx⌋}$ unbounded?
• 19 Examples of collapsing hierarchies
• 18 Units in the group ring over fours group after Gardam
• 16 If the center of a finite group is trivial, are there two elements whose centralizers intersect trivially?
• 13 Splendid groups
• 12 Is homeomorphism of simplicial complexes semidecidable?
• 12 Can matrices over $F[G]$ have infinite order when $G$ is periodic?
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