Module: Mathlib.Geometry.Manifold.Sheaf.LocallyRingedSpace

Goal state before:
pp: case mpr.refine_2.refine_1
𝕜 : Type u
inst✝⁵ : NontriviallyNormedField 𝕜
EM : Type u_1
inst✝⁴ : NormedAddCommGroup EM
inst✝³ : NormedSpace 𝕜 EM
HM : Type u_2
inst✝² : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
M : Type u
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace HM M
x : M
S : TopCat.Presheaf CommRingCat (TopCat.of M) := (smoothSheafCommRing IM 𝓘(𝕜, 𝕜) M 𝕜).presheaf
U : Opens M
hxU : x ∈ U
f : C^∞⟮IM, ↥U; 𝓘(𝕜, 𝕜), 𝕜⟯
hf : (eval IM 𝓘(𝕜, 𝕜) M 𝕜 x) ((CategoryTheory.ConcreteCategory.hom (S.germ U x hxU)) f) ≠ 0
hf' : f ⟨x, hxU⟩ ≠ 0
V : Opens M
hUV : V ≤ U
hV₀f : ∀ y ∈ Set.range (Set.inclusion hUV), f y ≠ 0
hV₀ : IsOpen[instTopologicalSpaceSubtype] (Set.range (Set.inclusion hUV))
hxV₀ : ⟨x, hxU⟩ ∈ Set.range (Set.inclusion hUV)
hxV : x ∈ ↑V
hVf : ∀ (y : ↥V), f (Set.inclusion hUV y) ≠ 0
g : C^∞⟮IM, ↥V; 𝓘(𝕜, 𝕜), 𝕜⟯ := ⟨(⇑f ∘ Set.inclusion hUV)⁻¹, ?mpr.refine_1⟩
⊢ (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) ((ContMDiffMap.restrictRingHom IM 𝓘(𝕜, 𝕜) 𝕜 hUV) f) *
      (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) g =
    1

pp: case mpr.refine_2.refine_2
𝕜 : Type u
inst✝⁵ : NontriviallyNormedField 𝕜
EM : Type u_1
inst✝⁴ : NormedAddCommGroup EM
inst✝³ : NormedSpace 𝕜 EM
HM : Type u_2
inst✝² : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
M : Type u
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace HM M
x : M
S : TopCat.Presheaf CommRingCat (TopCat.of M) := (smoothSheafCommRing IM 𝓘(𝕜, 𝕜) M 𝕜).presheaf
U : Opens M
hxU : x ∈ U
f : C^∞⟮IM, ↥U; 𝓘(𝕜, 𝕜), 𝕜⟯
hf : (eval IM 𝓘(𝕜, 𝕜) M 𝕜 x) ((CategoryTheory.ConcreteCategory.hom (S.germ U x hxU)) f) ≠ 0
hf' : f ⟨x, hxU⟩ ≠ 0
V : Opens M
hUV : V ≤ U
hV₀f : ∀ y ∈ Set.range (Set.inclusion hUV), f y ≠ 0
hV₀ : IsOpen[instTopologicalSpaceSubtype] (Set.range (Set.inclusion hUV))
hxV₀ : ⟨x, hxU⟩ ∈ Set.range (Set.inclusion hUV)
hxV : x ∈ ↑V
hVf : ∀ (y : ↥V), f (Set.inclusion hUV y) ≠ 0
g : C^∞⟮IM, ↥V; 𝓘(𝕜, 𝕜), 𝕜⟯ := ⟨(⇑f ∘ Set.inclusion hUV)⁻¹, ?mpr.refine_1⟩
⊢ (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) g *
      (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) ((ContMDiffMap.restrictRingHom IM 𝓘(𝕜, 𝕜) 𝕜 hUV) f) =
    1

Tactic:
· rw [← map_mul]
        -- Qualified the name to avoid Lean not finding a `OneHomClass` https://github.com/leanprover-community/mathlib4/pull/8386
        convert! RingHom.map_one _
        apply Subtype.ext
        ext y
        apply mul_inv_cancel₀
        exact hVf y

Goal state after:
case mpr.refine_2.refine_2
𝕜 : Type u
inst✝⁵ : NontriviallyNormedField 𝕜
EM : Type u_1
inst✝⁴ : NormedAddCommGroup EM
inst✝³ : NormedSpace 𝕜 EM
HM : Type u_2
inst✝² : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
M : Type u
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace HM M
x : M
S : TopCat.Presheaf CommRingCat (TopCat.of M) := (smoothSheafCommRing IM 𝓘(𝕜, 𝕜) M 𝕜).presheaf
U : Opens M
hxU : x ∈ U
f : C^∞⟮IM, ↥U; 𝓘(𝕜, 𝕜), 𝕜⟯
hf : (eval IM 𝓘(𝕜, 𝕜) M 𝕜 x) ((CategoryTheory.ConcreteCategory.hom (S.germ U x hxU)) f) ≠ 0
hf' : f ⟨x, hxU⟩ ≠ 0
V : Opens M
hUV : V ≤ U
hV₀f : ∀ y ∈ Set.range (Set.inclusion hUV), f y ≠ 0
hV₀ : IsOpen[instTopologicalSpaceSubtype] (Set.range (Set.inclusion hUV))
hxV₀ : ⟨x, hxU⟩ ∈ Set.range (Set.inclusion hUV)
hxV : x ∈ ↑V
hVf : ∀ (y : ↥V), f (Set.inclusion hUV y) ≠ 0
g : C^∞⟮IM, ↥V; 𝓘(𝕜, 𝕜), 𝕜⟯ := ⟨(⇑f ∘ Set.inclusion hUV)⁻¹, ?mpr.refine_1⟩
⊢ (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) g *
      (CategoryTheory.ConcreteCategory.hom (S.germ V x hxV)) ((ContMDiffMap.restrictRingHom IM 𝓘(𝕜, 𝕜) 𝕜 hUV) f) =
    1