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Proof step 13 from proof is_valid_ref-def (previous step)

class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st) ∨ is_array(str, r, st), ¬ is_obj(r, st) ∧ ¬ is_array(r, st) ∨ ¬ is_obj(str, r, st) ∧ ¬ is_array(str, r, st) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)
Proof step 12:
class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st) ∨ is_array(str, r, st), ¬ is_obj(r, st) ∧ ¬ is_array(r, st) ∨ ¬ (class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)) ∧ ¬ is_array(str, r, st) ⊦

Rule argument

[crewrite-arg: is-real-object-def, F, [st, r, str] → [st, r, str]]

Additional information

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