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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?
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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.
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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
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Apr
22
revised A disease spreading through a triangular population
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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