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Proof step 1 from proof nummult-eq (conclusion)
⊦ j ≠ 0 → ((* i) * i0 = (* j) ↔ j % i = 0 ∧ i0 = j / i ∧ i ≠ 0)
Special step normalize
And obtained the following new goals
Proof step 2
:
⊦ j ≠ 0 → (i * i0 = j ↔ j % i = 0 ∧ i0 = j / i ∧ i ≠ 0)