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Proof step 1 from proof pred-le (conclusion)

⊦ 0 < i → ¬ 2 ^ i ≤ 2 ^ (i - 1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

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

Rule argument

Additional information

Used simplifier rules: forward-le-05: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward) from specification int-abs