∀ {R : Type u_1} [inst : CommRing R] (I : Ideal R) (ι : Type u_4) [inst_1 : Fintype ι] [inst_2 : DecidableEq ι],
  ↑(AdicCompletion.piEquivOfFintype I fun x => R) ∘ₗ AdicCompletion.ofTensorProduct I (ι → R) =
    ↑(TensorProduct.piScalarRight R (AdicCompletion I R) (AdicCompletion I R) ι)