English
The presheaf of smooth functions from M to R naturally forms a presheaf of rings with restriction maps given by smooth restriction homomorphisms.
Русский
Прешеф гладких отображений образует прешеф колец с ограничениями по гладким отображениям.
LaTeX
$$smoothPresheafRing IM I M R$$
Lean4
/-- The presheaf of smooth functions from `M` to `R`, for `R` a smooth ring, as a presheaf
of rings. -/
def smoothPresheafRing : TopCat.Presheaf RingCat.{u} (TopCat.of M) :=
{ obj := fun U ↦ RingCat.of ((smoothSheaf IM I M R).presheaf.obj U)
map := fun h ↦ RingCat.ofHom <| ContMDiffMap.restrictRingHom IM I R <| CategoryTheory.leOfHom h.unop
map_id := fun _ ↦ rfl
map_comp := fun _ _ ↦ rfl }