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Proof step 6 from proof validref-subspec-samesubclasses-01 (
previous step
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⊦ has_classtype(ty) → ( ty ≤ ty0 ↔ ty .jtdims = ty0 .jtdims ∧ has_classtype(ty0) ∧ ty .jtclass ≤ ty0 .jtclass ∨ ty .jtdims > ty0 .jtdims ∧ has_classtype(ty0) ∧ ty0 .jtclass = `java.lang.Object' .class)
A spec-lemma