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Proof step 7 from proof isobj-all (previous step)

⊦ is_obj(r, class, sks, st) ↔ r ≠ jvmref ∧ r -- _type ∈ st ∧ st[r -- _type] = typeval(mkclasstype(class)) ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, st))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_obj(r, class1, sks, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class1)) ∈ st ∧ goodfieldsandtypes(r, sks, st)
Proof step 6:
⊦ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, sks, st) ↔ r ≠ jvmref ∧ r -- _type ∈ st ∧ st[r -- _type] = typeval(mkclasstype(class)) ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, st))

Rule argument

[crewrite-arg: is_obj, F, [st, sks, class1, r] → [st, sks, class, r]]

Additional information

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