theorem Dictionary.instCoeObserverObject._proof_1
theorem Dictionary.instCoeObserverObject._proof_1: ∀ (v : e4xks8h4.Dictionary.Observer), j12bzjgj.BFO.Object.Is (Subtype.val v)
theorem Dictionary.instCoeObserverObject._proof_1
theorem Dictionary.instCoeObserverObject._proof_1: ∀ (v : e4xks8h4.Dictionary.Observer), j12bzjgj.BFO.Object.Is (Subtype.val v)