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Proof step 4 from proof validref-isarrayref (previous step)

st[r -- _type] .type = mkarraytype(ty0), ty0 ≤ ty, is_valid_ref(str, r, st), validref(str, r, mkarraytype(ty), st), i ≤ st[r -- _length] .intval ⊦ r = jvmref, is_arrayref(r, i, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: ,is_valid_ref(str, r, st) ↔ is_obj(str, r, st) ∨ is_array(str, r, st) ,[st, r, str] → [st, r, str] ,F ,addfuns , ,is-valid-ref-stronger-def ]

Additional information

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