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Siksek
  • Member for 14 years, 10 months
  • Last seen more than a month ago
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comment
When is the sum of two quadratic residues modulo a prime again a quadratic residue?
This is an easy consequence of the fact that $x^2+y^2=z^2$ is a curve of genus $0$ and so have exactly $p$ projective solutions.
awarded
 Nice Answer
answered
The rank of a class elliptic curves
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 Yearling
comment
Isomorphism of semidirect products
Presumably $\hat{f} : \mathrm{Aut}(N) \rightarrow \mathrm{Aut}(N)$ sends $g$ to $f^{-1} \circ g \circ f$.
answered
Integer Points on the Elliptic Curve $y^2=x^3+17$.
accepted
Certain double covers of cubic surfaces
asked
Certain double covers of cubic surfaces
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 Critic
awarded
 Scholar
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 Supporter
accepted
Positivity of a finite sum
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 Student
asked
Positivity of a finite sum
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 Teacher
answered
hard diophantine equation: $x^3 + y^5 = z^7$
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