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Proof step 2 from proof perm-com1 (previous step)

perm(x + y, z), perm(z, x + y) ⊦ perm(y + x, z)

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] → [z, y, x] flags: rewrite, current

Additional information

Used terms: z, y, x