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Proof step 12 from proof perm-rmv-in-list (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: inst: name: shift-02 seq: ⊦ perm(x + x0, y) ↔ perm(x0 + x, y) subst: [y, x0, x] → [x0 + y0, x, y] flags: rewrite, current

Additional information

Used terms: x0 + y0, x, y