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Questions
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Does $(x^2 - 1)(y^2 - 1) = c z^4$ have a rational point, with z non-zero, for any given rational c?

may 23 12 at 2:01 Noam D. Elkies 18.1k●4●62●90

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The variety $x_1 + x_2 + .. + x_n = 0$, $x_1 x_2 .. x_n = 1$ for n > 4

jan 14 12 at 13:42 John R Ramsden 579●2●10

 
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The surface $ x^2 y^2 + 1 = (x^2 + y^2) z^2 $

jan 2 11 at 13:49 John R Ramsden 579●2●10

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Looking up the Mordell-Weil rank and generator(s) of a Weierstrass Equation

mar 5 11 at 23:10 Esteban Crespi 353●2●8

 
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Numerical method for finding characteristics of a square wave

jul 7 at 1:22 MathOverflow♦ 1●2●3

 
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Rank of $x (x^2 - 1) = c (c^2 - 1) y^2 $ over $\mathbb{Q}$ for given rational values of $c$

jun 18 at 1:08 Joseph O'Rourke 43.3k●1●49●214

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Rational solutions of $x (y - z) y (z - x) z (x - y) = t^2$

jul 28 at 22:46 John R Ramsden 579●2●10

 
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Dually automorphic varieties

may 29 at 22:21 François G. Dorais♦ 22.7k●2●48●113