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Proof step 6 from proof two-leone (previous step)

2 ^ i ≤ 1, 1 ≤ i, i ≤ 0 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ i ≤ j ↔ ¬ j < i

Rule argument

spec: int-abs name: le-def seq: ⊦ i ≤ j ↔ ¬ j < i subst: [j, i] → [0, i] flags: <all paths>

Additional information

Used simplifier rules: notone: ⊦ 1 < i ∧ 0 < j → ¬ i ^ j ≤ 1;% ⊦ 1 ≤ i ↔ 0 < i; (s) Used terms: 0, i