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Proof step 4 from proof validrefnotnull-array-01 (previous step)

validrefnotnull(str, r, mkarraytype(ty), st) ⊦ r = jvmref, is_integervalue(st[r -- _length])

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 3:
⊦ validref(str, r, mkarraytype(ty), st) ∧ r ≠ jvmref → is_integervalue(st[r -- _length])

Rule argument

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

Additional information

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