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Proof step 1 from proof sub-pred (conclusion)

⊦ i -1 = i - 1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: sub-add-01: ⊦ i + (j - i0) = i + j - i0;%numsub: ⊦ (* i) + i0 - (* j) = (i - j) + i0;%add-c: ⊦ i + j = j + i; from specification int-basic2%add-a: ⊦ i + j + i0 = (i + j) + i0; from specification int-basic2%add-zero-rev: ⊦ 0 + i = i; from specification int-basic2%succ-01: ⊦ i +1 = i + 1; from specification int-basic2%pred: ⊦ i = j -1 ↔ i +1 = j; from specification int-basic1