English
If G reflects isomorphisms and preserves/has colimits in appropriate sizes, then it reflects colimits of those shapes.
Русский
Если G отражает изоморфизмы и сохраняет колимиты в нужных размерах, то он отражает колимиты соответствующих форм.
LaTeX
$$$\\forall J\\; [G.ReflectsIsomorphisms]\\; [HasColimitsOfSize J\\; C]\\; [PreservesColimitsOfSize J\\; G] \\Rightarrow ReflectsColimitsOfSize J\\, G$$$
Lean4
/-- If `C` has colimits of shape `J` and `G` preserves them, then if `G` reflects isomorphisms then it
reflects colimits of shape `J`.
-/
theorem reflectsColimitsOfShape_of_reflectsIsomorphisms {G : C ⥤ D} [G.ReflectsIsomorphisms] [HasColimitsOfShape J C]
[PreservesColimitsOfShape J G] : ReflectsColimitsOfShape J G where
reflectsColimit {F} := reflectsColimit_of_reflectsIsomorphisms F G