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Proof step 21 from proof isobj-update-01 (previous step)

⊦ r = r0, is_obj(r, class, update(r0, fis, st)) ↔ is_obj(r, class, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st)
Proof step 20:
⊦ r = r0, r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ update(r0, fis, st) ∧ goodfieldsandtypes(r, instfields(class), update(r0, fis, st)) ↔ is_obj(r, class, st)

Rule argument

[crewrite-arg: is_obj-def , F , [st, class, r] → [update(r0, fis, st), class, r] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (update(r0, fis, st), class, r)]]