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Proof step 9 from proof validrefnotnull-subset (previous step)

validrefnotnull(str, r, ty, st), st ⊆ st1 ⊦ r = jvmref, validrefnotnull(str, r, ty, st1)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st)
Proof step 8:
validrefnotnull(str, r, ty, st), st ⊆ st1 ⊦ r = jvmref, r ≠ jvmref ∧ validref(str, r, ty, st1)

Rule argument

[crewrite-arg: validrefnotnull-def , F , [st, ty, r, str] → [st1, ty, r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st1, ty, r, str)]]