Mathematics
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abnry

Used to be in a PhD program. Then I lost my ability to concentrate. So I do math by asking dumb questions here.

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39 When to give up on a hard math problem? Jun 4 '14
29 Fractional Calculus: Motivation and Foundations. Mar 21 '14
24 Continuous generalization of $\sum_{k=0}^n {n \choose k} = 2^n$? Jan 10 '14
24 integral of $x^2e^{-x^2}~dx$ from $-\infty$ to $+\infty$ Dec 5 '13
21 What's the best way to measure mathematical ability? Oct 30 '13
20 How many different shapes can I make with this toy? Aug 1 '13
19 Solutions for x!/y!=(y+1)! Aug 30 '13
18 If $\sum a_n$ converges, prove $\sum a_n^3$ converges May 16 '14
17 Prove that if $3\mid a^2+b^2$ then $3\mid a$ and $3\mid b$. Mar 13 '15
17 Proving the irrationality of $e^n$ Aug 27 '13
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