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Proof step 9 from proof is_obj-notin-01 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st)
Proof step 8:
st[r -- _type] = typeval(mkclasstype(class)), r ∈ st, r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st), r -- _type ∈ st, class+∃(str, class), sk ∈ instfields(class) ⊦ r = jvmref, is_abstract(class), r -- sk ∈ st

Rule argument

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

Additional information

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