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Proof step 5 from proof two-leone (previous step)

2 ^ i ≤ 1 ⊦ i < 1, 1 < 2 ∧ 0 < i

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
2 ^ i ≤ 1, 1 ≤ i, i ≤ 0 ⊦

Rule argument

Additional information

Used simplifier rules: ⊦ i < j ↔ ¬ j ≤ i; (ss)