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Proof step 7 from proof perm-del (previous step)

perm(y -1l a, z), perm(x, y), perm(y, x), perm(z, y -1l a) ⊦ perm(x -1l a, z)

User applied rule insert lemma

And obtained the following new goals

Rule argument

spec: inst: name: trans seq: ⊦ perm(x, y) ∧ perm(y, z) → perm(x, z) subst: [x, y, z] → [x -1l a, y -1l a, z] flags: current, []

Additional information

Used simplifier rules: del-04: ⊦ perm(x, y) → perm(x -1l a, y -1l a); Used terms: x -1l a, y -1l a, z