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Proof step 20 from proof isobj-addobj (previous step)

⊦ r = r0, r ≠ jvmref ∧ r -- _type ∈ st ∧ st[r -- _type] = typeval(mkclasstype(class)) ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, addobj(r0, class0, fis, st))) ↔ is_obj(r, class, sks, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ is_obj(r, class, sks, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, st))
Proof step 19:
⊦ r = r0, r ≠ jvmref ∧ r -- _type ∈ st ∧ st[r -- _type] = typeval(mkclasstype(class)) ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, addobj(r0, class0, fis, st))) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ (∀ sk. sk ∈ sks → goodfieldandtype(r, sk, st))

Rule argument

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

Additional information

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