English
The proof object for the naturality of the 0th exterior power isomorphism is built from iso0 and its functorial behavior.
Русский
Доказательство натуральности нулевой внешней степени собирается из iso0 и его факторности по функтору.
LaTeX
$$$$ \\text{proof of } \\operatorname{natIso}_0 \\text{ is given by iso}_0 $$$$
Lean4
/-- The colimit of `F ⋙ forget₂ (ModuleCat R) AddCommGrpCat` in the category `AddCommGrpCat`.
In the following, we will show that this has the structure of an `R`-module.
-/
def M : AddCommGrpCat :=
AddCommGrpCat.FilteredColimits.colimit.{v, u} (F ⋙ forget₂ (ModuleCat R) AddCommGrpCat.{max v u})