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• 63 How to find the determinant of this $3 \times 3$ Hankel matrix?
• 52 Problems understanding proof of if $x + y = x + z$ then $y = z$ (Baby Rudin, Chapter 1, Proposition 1.14)
• 49 Is arrow notation for vectors "not mathematically mature"?
• 35 Does "red apples and bottles" mean "the apples are red and the bottles are red" or "only apples are red"?
• 34 Proof of the Hockey-Stick Identity: $\sum\limits_{t=0}^n \binom tk = \binom{n+1}{k+1}$
• 34 Why factorials above 85 contain zero's at the end.
• 29 Why are subsets of compact sets not compact?
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