Mathematics
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Daniel Fischer♦
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A long time ago, I studied mathematics. I used to know three or four things about complex analysis, topological vector spaces, and point set topology. But I've forgotten at least five of them.

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190 Why does the google calculator give $\tan 90^{\circ} = 1.6331779e^{+16}$? Oct 22 '13
131 An inequality: $1+\frac1{2^2}+\frac1{3^2}+\dotsb+\frac1{n^2}\lt\frac53$ Dec 31 '13
122 What is the smallest unknown natural number? Jun 7 '15
54 Is it possible to solve this equation by hand? Feb 28 '14
47 Reflection across a line? Oct 13 '13
43 Proof that one large number is larger than another large number Nov 1 '13
42 Proving that $\frac{\pi}{4}$$=1-\frac{\eta(1)}{2}+\frac{\eta(2)}{4}-\frac{\eta(3)}{8}+\cdots$ Sep 3 '13
42 Why is $(\sqrt{2}+\sqrt{3})^{2008}$ so close to an integer? Jun 9 '14
38 Example of a sequence with more than one limit. Apr 16 '14
38 If $\sum\frac1{a_n}$ is convergent, then irrational? May 14 '14
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