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Proof step 6 from proof contains-length (previous step)

fs ' = _length, type∃(str, ty), is_arraytype(ty) ⊦ is_reftype(ty)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ is_arraytype(ty) ↔ (∃ ty0. ty = mkarraytype(ty0))

Rule argument

[speclemmaarg: ,is_arraytype(ty) ↔ (∃ ty0. ty = mkarraytype(ty0)) ,[ty] → [ty] ,F ,javatype , ,ex-02 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ type∃(str, mkarraytype(ty)) ↔ type∃(str, ty)], [CSIMPSEQ : ⊦ is_reftype(mkarraytype(ty))])], [EXTRATERMS : (ty)]]