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Proof step 35 from proof validrefs-levelsubset-01 (previous step)

⊦ is_array(str, r, st) ∧ st[r -- _type] .type ≤ ty → ( validref(str, r, ty, st) ↔ ¬ (∃ i. 0 ≤ i ∧ i < st[r -- _length] .intval ∧ is_referencevalue(st[r -- i ']) ∧ st[r -- i '] .refval ≠ jvmref ∧ ( ¬ st[st[r -- i '] .refval -- _type] .type ≤ st[r -- _type] .type .type ∨ ¬ validref(str, st[r -- i '] .refval, st[r -- _type] .type .type, st))))

A spec-lemma