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Gauss (1875, posthumous),
Lebesgue (1843), Lamé (1847),
Gambioli (1901),
Werebrusow (1905),[full
citation needed] Rychlík (1910),[dubious – discuss][full...
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Alternative proofs were
developed by Gauss, Lebesgue, Lamé, Gambioli,
Werebrusow, Rychlik, van der Corput, and Terjanian. Dirichlet's
proof for n = 5 is...