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Proof step 7 from proof validrefkeynotnull-notnewref (previous step)

st[rk] = refval(r), newref(r, st), rk ∈ st, validrefnotnull(str, r, ty, st) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st)
Proof step 6:
⊦ newref(r, st) → ¬ validref(str, r, ty, st)

Rule argument

[crewrite-arg: validrefnotnull-def , F , [st, ty, r, str] → [st, ty, r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty, r, str)]]