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Proof step 10 from proof perm-rmv-in-list (previous step)

⊦ perm(x0 + y0, y + x) ↔ perm(x + y, x0 + y0)

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 + x, x0 + y0] flags: rewrite, current

Additional information

Used terms: y + x, x0 + y0