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Proof step 4 from proof is_obj-no-interface (previous step)

st[r -- _type] .type = mkclasstype(class), interface∃(str, class), is_obj(r, st), class+∃(str, class) ⊦ is_abstract(class)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class)
Proof step 3:
st[r -- _type] .type = mkclasstype(class), interface∃(str, class), is_obj(r, st), class∃(str, class) ∨ is_predefined_class(class) ⊦ is_abstract(class)

Rule argument

[speclemmaarg: ,class+∃(str, class) ↔ class∃(str, class) ∨ is_predefined_class(class) ,[class, str] → [class, str] ,F ,typefuns , ,classex-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (class, str)]]