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Proof step 7 from proof junkrefs-put-nopathexplus-equiv (
previous step
)
⊦ path∃+(str, r, r0, st) ↔ r = r0 ∨ (∃ refs. refs ≠ [] ∧ refs .first = r ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st) ∧ step∃(str, refs .last, r0, st))
Lemma
pathex-plus-def