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Phira

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77 True or false? $x^2\ne x\implies x\ne 1$ Dec 5 '11
48 Identity for convolution of central binomial coefficients: $\sum\limits_{k=0}^n \binom{2k}{k}\binom{2(n-k)}{n-k}=2^{2n}$ May 9 '11
45 Order of finite fields is $p^n$ Oct 15 '11
39 Why not include as a requirement that all functions must be continuous to be differentiable? Jun 19 '18
35 “How long 'til we get there?” Road trip puzzle Nov 27 '12
34 How to study math to really understand it and have a healthy lifestyle with free time? Oct 24 '11
33 Why worry about commutativity but not associativity in The Fundamental Theorem of Arithmetic? Nov 2 '11
28 The Mathematics of Tetris Nov 8 '11
25 How can I sum the infinite series $\frac{1}{5} - \frac{1\cdot4}{5\cdot10} + \frac{1\cdot4\cdot7}{5\cdot10\cdot15} - \cdots\qquad$ Apr 23 '11
23 Intuitive use of logarithms Apr 29 '11
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