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Proof step 13 from proof isobj-rec (conclusion)

⊦ is_obj(r, class, sk ' + sks, st) ↔ goodfieldandtype(r, sk, st) ∧ is_obj(r, class, sks, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_obj(r, class, sks, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, st))
Proof step 12:
⊦ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ (∀ sk0. sk0 ∈ sk ' + sks → goodfieldandtype(r, sk0, st)) ↔ goodfieldandtype(r, sk, st) ∧ is_obj(r, class, sks, st)

Rule argument

[crewrite-arg: isobj-all , F , [st, sks, class, r] → [st, sk ' + sks, class, r] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, sk ' + sks, class, r)]]