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 Mar 7 answered Do we need to formally teach the Greek Alphabet? Feb 8 answered Help in understanding risch algorithm Feb 2 awarded Announcer Jan 11 comment Pedagogy: How to cure students of the “law of universal linearity”? Maybe "universal distributivity" would be a better name. In my experience, students love to distribute over addition, but it's less common that they want to pull out constants. Jan 11 answered Pedagogy: How to cure students of the “law of universal linearity”? Dec 21 comment Infiniteness of non-twin primes. I think the dash in the title is in the wrong place. I thought you were looking for infinitely many primes $p, q$ with $p - q \neq 2$. Dec 15 comment Understanding a proof of Diaconescu's theorem "If $X=Y$ then the quoted definition would not give a function." Thanks, I think this was the key point I was missing. Dec 15 accepted Understanding a proof of Diaconescu's theorem Nov 24 awarded Good Answer Nov 19 answered Derivative of big O symbol Nov 19 comment Derivative of big O symbol $f(x) = O(1)$ just means that $f(x)$ is bounded near $0$. So your question just becomes, "if $f(x)$ is bounded near $0$ and $f(x)$ is analytic at $0$, then is $f'(x)$ bounded near $0$?". Nov 4 comment Equivalence relation in finite subset of $\mathbb N$ "Now, it is easy to prove that if a positive rational number squared is natural, then the rational number itself is natural." +1. This way is much better than using factorization. Nov 4 revised Equivalence relation in finite subset of $\mathbb N$ don't use . for multiplication Nov 4 answered Why don't I get $e$ when I solve $\lim_{n\to \infty}(1 + \frac{1}{n})^n$? Nov 4 comment Why don't I get $e$ when I solve $\lim_{n\to \infty}(1 + \frac{1}{n})^n$? I've found an easier way to remember it as $\log(1^\infty) = \infty\log(1) = \infty 0$ (if it were determinate, then taking the log would preserve this). Sep 18 awarded Popular Question Aug 29 comment Is it possible to put $+$ or $-$ signs in such a way that $\pm 1 \pm 2 \pm \cdots \pm 100 = 101$? Frankly, I like your proof better than any of the answers. Aug 29 answered Is there another simpler method to solve this elementary school math problem? Aug 25 comment How to prove $n!>(\frac{n}{e})^{n}$ Some of the answers at math.stackexchange.com/questions/338954/… are related to this. Aug 4 awarded Yearling