English
For the functor tensorProd R S, the underlying object preserves finite products in the Under category, i.e., it respects finite limits through a natural isomorphism.
Русский
Для тензорного произведения tensorProd R S функция сохраняет конечные произведения в категории Under, то есть сохраняет конечные пределы через естественное изоморфизм.
LaTeX
$$$\\text{PreservesFiniteProducts }(R \\otimes S) $ in Under$$
Lean4
instance : PreservesFiniteProducts (tensorProd R S) where
preserves
n :=
let J : Type u := ULift.{u} (Fin n)
have : PreservesLimitsOfShape (Discrete J) (tensorProd R S) := preservesLimitsOfShape_of_discrete (tensorProd R S)
preservesLimitsOfShape_of_equiv (Discrete.equivalence Equiv.ulift) (R.tensorProd S)