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tetori earned this badge 4 times
mar 1 at 0:11
The series $\sum_{n=1}^{+\infty}\frac{1}{1^2+2^2+\cdots+n^2}.$
feb 20 at 1:35
An inequality using mathematical induction
jan 5 at 16:30
Does $\bigcap_{n=1}^{+\infty}(-\frac{1}{n},\frac{1}{n}) = \varnothing$?
jan 2 at 14:18
$3x^2 ≡ 9 \pmod{13}$

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