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 2d awarded Revival Apr14 awarded Revival Apr8 awarded Yearling Mar14 awarded Nice Answer Feb27 awarded Reversal Feb18 awarded number-theory Sep30 awarded Explainer Aug21 answered What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) Jul2 awarded Curious Jun24 revised Cauchy-Schwarz type formula for positive integral operator edited title Jun24 revised Correlation coefficient calculation deleted 1 character in body Jun24 revised Proof of the Bergström inequality using Cauchy deleted 1 character in body Jun24 revised $|f(x)|\leq \sqrt{\frac{\pi}{3}\int_0^\pi f'^2}$ deleted 1 character in body Jun20 asked Existence of sets with four common elements among 16000 sets. May30 comment Finding an expression to represent this pattern You really need to tell us more about the source of these numbers. In particular, are the decimal numbers rounded or exact? May30 revised Old Qualifying Exam Problem topology added 1 character in body May30 revised Why does there exist a lift from $RP(2)$ to $S^2$? added 1 character in body May30 revised $\dim$ $C(X,\mathbb{R})<\infty$ we need to show $|X|<\infty$, added 1 character in body May30 revised prove that it's not provable added 1 character in body May30 revised Riemann integrable and continuous almost everywhere. edited title