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Proof step 2 from proof is_obj-not-classex-02 (conclusion)

⊦ ¬ class∃(str, class) ∧ st[r -- _type] .type = mkclasstype(class) ∧ ¬ is_predefined_class(class) → ¬ is_obj(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_predefined_class(class) → ¬ is_abstract(class)], [CSIMPSEQ : ⊦ ¬ class∃(str, class) → ( class+∃(str, class) ↔ is_predefined_class(class))], [CSIMPSEQ : ⊦ mkclasstype(class) .class = class])]]