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 1d reviewed Close Best practice book for calculus 1d reviewed Close Existence/non-existence of Holomorphic Function 1d reviewed Reviewed Proof in modern algebra. Prove $(n-1)! = -1 \ (\textrm{mod n})$ iff n is prime Apr 28 comment Right Triangle's Proof @miracle173 Oops, wrong text. Thanks. I corrected it. Yes, I admit that your answer is better. (I upvoted it.) I didn't have time to make a more elegant answer, but I posted what I knew in the hopes that it might help the OP. Apr 28 revised Right Triangle's Proof added 8 characters in body Apr 28 comment Right Triangle's Proof See OEIS A046081 for more information. Apr 28 revised Right Triangle's Proof added 169 characters in body Apr 28 answered Right Triangle's Proof Apr 28 comment Right Triangle's Proof A few are $(5,12,13)$, $(12,16,20)$, $(9,12,15)$, ... Apr 28 reviewed Looks OK What is the Laurent expansion of f(z)=1/(z-3)? Apr 28 comment Right Triangle's Proof Are you familiar with Pythagorean triples? What triples that include 12 do you know? Apr 26 reviewed Reviewed Generator Powers Apr 26 comment Generator Powers That's nice. So what is the question? Apr 26 reviewed Looks OK Let $f\in L^p$. Can we say $\|f\|_{L^{p}} \leq \epsilon$ on $|x|\geq R$ for large $R$? Apr 25 answered finding the growth rate for exponential growth Apr 25 comment Evaluating $\lim\limits_{x \to -\infty} \sqrt{x^2 + 3x} - \sqrt{x^2 + x}$. Is Wolfram wrong or is it me? Henning Makholm's comment above refers to the original post, where the first line was an equation involving infinity. The edit by rubik removed this line. Apr 24 reviewed Close how to prove $\left( {\frac{1}{\sin z}} \right)^{2}=\sum_{-\infty}^{+\infty}\frac{1}{\left( {z-\pi n} \right)^2}$ Apr 24 comment Evaluating $\lim\limits_{x \to -\infty} \sqrt{x^2 + 3x} - \sqrt{x^2 + x}$. Is Wolfram wrong or is it me? So, since $x<0$, when you divided the denominator by $\sqrt{x^2}$, you should have divided the numerator by $-x$. Apr 24 answered Evaluating $\lim\limits_{x \to -\infty} \sqrt{x^2 + 3x} - \sqrt{x^2 + x}$. Is Wolfram wrong or is it me? Apr 24 reviewed Close Markov Chain Market Share Model