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John R Ramsden's user avatar
John R Ramsden's user avatar
John R Ramsden's user avatar
John R Ramsden
  • Member for 14 years, 1 month
  • Last seen more than 7 years ago
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33
What is the defining property of reductive groups and why are they important?
30
Not especially famous, long-open problems which anyone can understand
20
Does $(x^2 - 1)(y^2 - 1) = c z^4$ have a rational point, with z non-zero, for any given rational c?
10
Why are conformal transformations so prevalent in physics?
9
Rational solutions of $x^2 + y^2 = z (z^2 - 1)$