AlanH
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 Jun 2 comment Showing existence of an element with order $p$ Sorry, I was referring to how I need to pick that $a$ such that the order is one of $p^1, \dots, p^n$. Jun 2 comment Find all positive integers $x$ such that $13 \mid (x^2 + 1)$ Is there a general form of the first sentence you stated? Jun 2 accepted Find all positive integers $x$ such that $13 \mid (x^2 + 1)$ Jun 2 revised Find all positive integers $x$ such that $13 \mid (x^2 + 1)$ added 39 characters in body Jun 2 asked Find all positive integers $x$ such that $13 \mid (x^2 + 1)$ Jun 2 comment Showing existence of an element with order $p$ Do you mind explaining further? I'm still not sure what to do. Jun 2 accepted Showing existence of an element with order $p$ May 29 asked Showing existence of an element with order $p$ May 27 accepted Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$ May 27 comment Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$ but $r$ is indexed May 27 comment Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$ In my text, I have an identity $\sum_{r\geq 0} \binom{r + n}{r} x^r = 1/(1-x)^{n+1}$ This may be the cause of my confusion, but is this identity correct and is it equivalent to the one you used? May 27 comment Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$ Is there a typo in the second equation (first sum)? I believe $k$ should be indexed. May 26 comment Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent yeah, I got the same thing, but I just didn't express the final step like that. Does it matter though? May 26 accepted Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent May 26 comment Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent $z > 1-\bar{z}$? May 26 revised Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent edited tags May 26 asked Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent May 22 asked Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$ May 19 awarded Constituent May 19 asked Proving that $X$ is a subgroup of $G$