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- 111 Why did no student correctly find a pair of $2\times 2$ matrices with the same determinant and trace that are not similar?
- 94 Is there any conjecture that we know is provable/disprovable but we haven't found a proof of yet?
- 82 How to represent "not an empty set"?
- 72 Prime number construction game
- 55 Can anyone give me a good example of two interestingly different ordinary cohomology theories?
- 54 What is wrong with my "disproof" of Cantor's Theorem?
- 53 What are some reasonable-sounding statements that are independent of ZFC?
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9 Help cleanup tags! Dec 9 '14
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