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Proof step 4 from proof pot2-le-pred (previous step)

¬ 0 < i, 2 ^ i < 2 ^ (i - 1) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
2 ^ i < 2 ^ (i - 1), i ≤ 0 ⊦

Rule argument

Additional information

Used simplifier rules: forward-le-04: ⊦ j ≤ i ∧ i ≤ 0 → j ≤ 0; (forward) from specification int-abs%lels: ⊦ ¬ i < j ↔ j ≤ i; from specification int-abs