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Proof step 4 from proof sperm (previous step)

perm(x, sort(x)) ⊦ sort(x) = sort(y) ↔ perm(x, y)

User applied rule insert lemma

And obtained the following new goals

Proof step 5:
⊦ perm(x, sort(x))
Proof step 6:
perm(y, sort(y)), perm(x, sort(x)) ⊦ sort(x) = sort(y) ↔ perm(x, y)

Rule argument

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

Additional information

Used terms: y