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Proof step 8 from proof papp-03 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

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

Additional information

Used terms: y0, x0, y, x