A one-sentence proof that every prime pΞ1(mod 4) is a sum of two squares
American Mathematical Monthly
Is there a circle that passes through a given number of lattice points?
European Journal of Combinatorics
Proofs from THE BOOK
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We prove that for every nd=m=2, there is a sphere in R^d that passes through exactly n lattice points, and moreover these n lattice points span an m-dimensional flat.