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Eigenvalues of A^2+B^2 from those of A, B and A+B.

may 26 11 at 9:21 Denis Serre 18.7k●1●31●93

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When is the sum of two quadratic residues modulo a prime again a quadratic residue?

may 18 11 at 9:42 GH 14.9k●1●31●53

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A G-delta-sigma that is not F-sigma?

jul 19 11 at 12:46 Goldstern 5,240●1●12●27

 
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G-delta of measure 0 containig the rationals.

feb 6 11 at 1:43 Julián Aguirre 1,191●5●11

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Is the Fourier transform of 1/(1-log(1-x^2)) (supported in [-1,1]) integrable?

oct 25 10 at 18:26 Terry Tao 27.6k●4●107●178