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Proof step 5 from proof div-one-one (previous step)

∃ i0. i * i0 = 1 ⊦ i = 1, i = ~1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
abs(i0) = 1 ⊦ i0 = ~1, i0 = 1

Rule argument

Additional information

Used simplifier rules: commutativity: ⊦ i * j = j * i; from specification int-mult%associativity: ⊦ i * j * j0 = (i * j) * j0; from specification int-mult%eq-one: ⊦ i * j = 1 ↔ abs(i) = 1 ∧ i = j; from specification int-mult