English
UniformProd_C D is the same as the standard product category, with both factors living in the same universe level to aid typeclass resolution.
Русский
UniformProd_C D является тем же самым произведением, но с теми же уровнями вселенных для облегчения резольвирования типоклассов.
LaTeX
$$$\text{uniformProd}\; C \; D := \text{Prod } C D$$$
Lean4
/-- `Category.uniformProd C D` is an additional instance specialised so both factors have the same
universe levels. This helps typeclass resolution.
-/
instance uniformProd : Category (C × D) :=
CategoryTheory.prod C D