theorem instCoeDepTypeHistoryOfIs._proof_1
theorem instCoeDepTypeHistoryOfIs._proof_1: ∀ (x : Type) [ta3nj1a4.History.Is x], ta3nj1a4.History.Is x
theorem instCoeDepTypeHistoryOfIs._proof_1
theorem instCoeDepTypeHistoryOfIs._proof_1: ∀ (x : Type) [ta3nj1a4.History.Is x], ta3nj1a4.History.Is x