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Proof step 2 from proof div-twopot (previous step)

0 ≤ i, 0 ≤ j ⊦ 2 ^ i / 2 ^ j = 2 ^ (i - j)

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 3:
i = i0 + j, 0 ≤ i, 0 ≤ j ⊦ 2 ^ i / 2 ^ j = 2 ^ i0

Rule argument

spec: int-abs inst: name: elim-sub seq: ⊦ i0 = i - j ↔ i = i0 + j subst: [i, j, i0] → [i, j, i0] flags:

Additional information

Used simplifier rules: ⊦ i0 = i - j ↔ i = i0 + j; (elim) Used terms: i, j, i0