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Proof step 1 from proof pred-rmerge (conclusion)

⊦ i * j - i = i * (j - 1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ i * j = i * (j - 1) + i

Rule argument

Additional information

Used simplifier rules: sub-eq: ⊦ i - j = i0 ↔ i = i0 + j; from specification int-abs