mercio
Reputation
32,353
110/100 score
 22h comment perfect squares in $\mathbb{Q}(\sqrt{2},\sqrt{91})$ if this polynomial doesn't have a multiple root, this is an elliptic curve over $k = \Bbb Q(\sqrt 2,\sqrt {91})$ and you're looking for points over $k$ (other than the points at infinity) 1d answered Solutions of $\tan(z) = \frac{z}{z^{2} + 1}$ in the complexes 1d comment Subgroups of $\mathbb{Q}/ \mathbb{Z}$ um what does $p^i$ mean when $i$ is a subgroup ? 1d answered Is $\Bbb Q[x]/(x^2+x)$ isomorphic to $\Bbb Q[x]/(x^2-x)$? Apr 29 comment Surjective exponentials for algebraically closed fields um.... why does $K^*$ being $q$-divisible for all $q>0$ imply that $K$ is algebraically closed ? Apr 28 revised Does rationality of $\cosh(nx)$ and $\cosh((n+1)x)$ imply rationality of $\cosh(x)$? added 688 characters in body Apr 28 revised Does rationality of $\cosh(nx)$ and $\cosh((n+1)x)$ imply rationality of $\cosh(x)$? edited body Apr 28 awarded calculus Apr 28 revised Does rationality of $\cosh(nx)$ and $\cosh((n+1)x)$ imply rationality of $\cosh(x)$? added 161 characters in body Apr 28 answered Does rationality of $\cosh(nx)$ and $\cosh((n+1)x)$ imply rationality of $\cosh(x)$? Apr 27 comment The mapping defines a unique automorphism you can write down the definition of idempotent and see it's blatantly false Apr 25 revised What is the optimal path between $2$ fixed points around an invisible obstructing wall? added 20 characters in body Apr 25 revised What is the optimal path between $2$ fixed points around an invisible obstructing wall? added 260 characters in body Apr 22 answered A disease spreading through a triangular population Apr 22 revised What is the Taylor series expansion of $z^{1/2}$ about origin. edited body Apr 22 answered What is the Taylor series expansion of $z^{1/2}$ about origin. Apr 22 revised A disease spreading through a triangular population added 163 characters in body Apr 22 revised A disease spreading through a triangular population added 773 characters in body Apr 21 comment A disease spreading through a triangular population If you interpret the nodes at even positions as a top row of nodes, $\circ$ is a noninfected node, $\bullet$ an infected node that doesn't infect his right child, and $\hat \bullet$ is an infected node that infects his right child. Due to properties of the Markov chain, they are all i.i.d. variables. Then, the nodes at odd positions are the bottom row of nodes (the next generation). $\circ$ are uninfected, and $\bullet, \hat \bullet$ are infected, but I'm not sure if there is a natural interpretation of the hat. Apr 19 revised What is the optimal path between $2$ fixed points around an invisible obstructing wall? added 83 characters in body