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Proof step 3 from proof invx (previous step)

inv(a, Pelem), p*(a, b) ⊦ Pelem(b)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ inv(a, Pelem) ↔ (∀ b. p*(a, b) → Pelem(b))
Proof step 5:
p*(a, b), ∀ b. p*(a, b) → Pelem(b) ⊦ Pelem(b)

Rule argument

spec: <toplevel> name: inv seq: ⊦ inv(a, Pelem) ↔ (∀ b. p*(a, b) → Pelem(b)) subst: [Pelem, a] → [Pelem, a] flags: <all paths>

Additional information

Used terms: Pelem, a