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Proof step 18 from proof fermat-1 (previous step)

i < 0, 2 | abs(i ^ 2 - ~ i) ⊦ i = 0, ≡mod(i ^ 2, i, 2)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 19:
i < 0, 2 | i ^ 2 + i ⊦ i = 0, ≡mod(i ^ 2, i, 2)

Rule argument

Additional information

Used simplifier rules: div-abs-02: ⊦ i | abs(j) ↔ i | j; from specification int-gcd%subneg: ⊦ i - ~ j = i + j; from specification int-abs