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Proof step 4 from proof is_obj-full-expand (previous step)

st[r -- _type] = typeval(mkclasstype(class)), class+∃(str, class), r -- _type ∈ st, r ∈ st ⊦ is_obj(r, class, st) ↔ goodfieldsandtypes(r, instfields(class), st), r = jvmref, is_abstract(class)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st)

Rule argument

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

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ rk × val ∈ st ↔ rk ∈ st ∧ st[rk] = val])], [EXTRATERMS : (st, class, r)]]