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Proof step 6 from proof is_valid_ref (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ ¬ is_obj(r, st) → (is_valid_ref(r, st) ↔ is_array(r, st))
Proof step 5:
⊦ is_obj(r, st) → is_valid_ref(r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_array(r, st) → ¬ is_array(str, r, st)])]]