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Proof step 7 from proof validrefnotnull-is-junk (previous step)

validrefnotnull(str, r, ty, st), ¬ st[r -- _type] .type ≤ ty ∧ ¬ type∃(str, st[r -- _type] .type) ∨ ¬ is_valid_ref(str, r, st) ⊦ r = jvmref

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st)
Proof step 6:
r ≠ jvmref ∧ validref(str, r, ty, st), ¬ st[r -- _type] .type ≤ ty ∧ ¬ type∃(str, st[r -- _type] .type) ∨ ¬ is_valid_ref(str, r, st) ⊦ r = jvmref

Rule argument

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

Additional information

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