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Proof step 1 from proof perm (conclusion)

⊦ perm(sort(x), y) ↔ perm(x, y)

User applied rule insert lemma

And obtained the following new goals

Proof step 2:
⊦ perm(x, sort(x))
Proof step 3:
perm(x, sort(x)) ⊦ perm(sort(x), y) ↔ perm(x, y)

Rule argument

spec: olist-sort inst: name: Perm seq: ⊦ perm(x, sort(x)) subst: [x] → [x] flags: current, []

Additional information

Used terms: x