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Proof step 1 from proof Lagrange-SumOf4Squares-primes (conclusion)

prime(j), j ≠ 2 ⊦ ∃ i, i0, i1, i2. j = i ^2 + i0 ^2 + i1 ^2 + i2 ^2

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information