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Proof step 8 from proof junkrefs-put-nopathexplus-equiv (previous step)

junkrefs(str, r0 ' + refs0, ty, st), ∀ val, sk, r0, st, ty, r, str, refs. # refs < # refs0 → (junkrefs(str, r ' + refs, ty, st) → junkrefs(str, r ' + refs, ty, st[r0 -- sk, val]) ∨ sk = _type ∨ path∃+(str, r, r0, st)) ⊦ r0 = jvmref, sk = _type, junkrefs(str, r0 ' + refs0, ty, st[r0 -- sk, val]), path∃+(str, r0, r0, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ 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))

Rule argument

[crewrite-arg: pathex-plus-def , F , [st, r0, r, str] → [st, r0, r0, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r0, r0, str)]]