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 Oct21 awarded Revival Sep1 awarded Yearling May27 revised Show $\dfrac{x_1}{x_n} + \dfrac{x_2}{x_{n-1}} + \dfrac{x_3}{x_{n-2}} + \dots + \dfrac{x_n}{x_1} \geq n$ added 36 characters in body May27 answered Show $\dfrac{x_1}{x_n} + \dfrac{x_2}{x_{n-1}} + \dfrac{x_3}{x_{n-2}} + \dots + \dfrac{x_n}{x_1} \geq n$ May20 awarded Constituent May15 asked Inferring a probability distribution from another probability distribution May13 comment Prove $|\vec{a_1}-\vec{b}|+ \cdots +|\vec{a_n}-\vec{b}| > n$ The condition given is $|\vec{b}|<1$, not $|\vec{b}|>1$. May7 awarded Caucus May4 revised How prove this $T_{n}<\dfrac{5}{4}|b_{1}|$ added 10 characters in body May4 answered How prove this $T_{n}<\dfrac{5}{4}|b_{1}|$ May4 revised How to show the following inequality? added 72 characters in body May3 answered How to show the following inequality? May3 answered Prove $|\vec{a_1}-\vec{b}|+ \cdots +|\vec{a_n}-\vec{b}| > n$ May1 comment Variance over two periods with known variances? A clear explanation, easily generalizable to cases with more than two sets. Apr24 revised Find the maximum value of $T=\frac{2}{3}(\cos 2A-\cos 2B)-\tan\frac{C}{2}$ added 139 characters in body Apr24 answered Find the maximum value of $T=\frac{2}{3}(\cos 2A-\cos 2B)-\tan\frac{C}{2}$ Apr23 comment Geometric interpretation for sum of fourth powers 30 comes from the fact that the Bernoulli number $B_4=-1/30$. See "Faulhaber's formula" in Wikipedia. Apr22 revised Solving a PDE using the method of characteristics edited body Apr22 asked Solving a PDE using the method of characteristics Mar24 revised When does the summation of a quotient equal the quotient of summations? deleted 37 characters in body