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erdos_399.variants.cambie

Specification

Cambie observed that there are no solutions to `n! = x^4 + y^4` with `x.Coprime y` and `x*y > 1`.

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Lean 4 Statement 
theorem erdos_399.variants.cambie {n x y : ℕ} :
    x.Coprime y → 1 < x * y → n ! ≠ x ^ 4 + y ^ 4
ID: ErdosProblems__399__erdos_399.variants.cambie
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