English
The ULift version of natural/int casts aligns with the original casts: up (n : R) = n and up (n : ℤ) = n in ULift R, under the appropriate NatCast/IntCast assumptions.
Русский
В ULift совпадают отображения нат. и целых степеней: up (n : R) = n и up (n : ℤ) = n при заданных предположениях NatCast/IntCast.
LaTeX
$$$up(n : R) = n, \; up(n : ℤ) = n$$$
Lean4
@[simp, norm_cast]
theorem up_intCast [IntCast R] (n : ℤ) : up (n : R) = n :=
rfl