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- 154 Is there a homology theory that counts connected components of a space?
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- 42 Does there exist $f:(0,\infty)\to(0,\infty)$ such that $f'=f^{-1}$?
- 39 What is the sum of sum of digits of $4444^{4444^{4444}}$?
- 35 Does $abab=baba$ imply commutativity in a Group of uneven order?
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