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- 35 In combinatorics, how can one verify that one has counted correctly?
- 32 How to prove $(a-b)^3 + (b-c)^3 + (c-a)^3 -3(a-b)(b-c)(c-a) = 0$ without calculations
- 23 How can I learn about generating functions?
- 19 How can I learn about generating functions?
- 17 Given a book with $100$ pages and a $100$ lemmas, prove that there is some lemma written on the same page as its index
- 11 Converting absolute value program into linear program
- 11 Probability of 20 consecutive success in 100 runs.
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