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Proof step 12 from proof contains-length (conclusion)

⊦ is_arraytype(ty) ∧ fs ' = _length → (contains(str, ty, fs) ↔ type∃(str, ty))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
fs ' = _length, is_arraytype(ty) ⊦ contains(str, ty, fs) ↔ type∃(str, ty)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]