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Proof step 3 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_predefined_class(class) ⊦ is_abstract(class)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ interface∃(str, class) → ¬ is_predefined_class(class)], [CSIMPSEQ : ⊦ interface∃(str, class) → ¬ class∃(str, class)])]]