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Proof step 4 from proof sym (previous step)

⊦ perm(x, y) ↔ y ⊆m x ∧ x ⊆m y

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ perm(x, y) ↔ x ⊆m y ∧ y ⊆m x

Rule argument

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

Additional information

Used terms: y, x