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Proof step 7 from proof perm-rev-01 (previous step)

perm(x, rev(y)), perm(rev(y), x) ⊦ perm(x, y), perm(rev(y), y)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: inst: name: sym seq: ⊦ perm(x, y) ↔ perm(y, x) subst: [y, x] → [y, rev(y)] flags: rewrite, current

Additional information

Used simplifier rules: perm-rev: ⊦ perm(x, rev(x)); Used terms: y, rev(y)