Module: Mathlib.CategoryTheory.Limits.Shapes.Pullback.PullbackCone

Goal state before:
pp: case none.none.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id none) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id none)

pp: case some.left.none.term
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (term WalkingPair.left) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (term WalkingPair.left)

pp: case some.left.some.left.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id (some WalkingPair.left)) ≫
      Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id (some WalkingPair.left))

pp: case some.right.none.term
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (term WalkingPair.right) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (term WalkingPair.right)

pp: case some.right.some.right.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id (some WalkingPair.right)) ≫
      Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id (some WalkingPair.right))

Tactic:
<;>

Goal state after:
case none.none.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id none) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id none)

case some.left.none.term
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (term WalkingPair.left) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (term WalkingPair.left)

case some.left.some.left.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id (some WalkingPair.left)) ≫
      Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.left) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id (some WalkingPair.left))

case some.right.none.term
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (term WalkingPair.right) ≫
      Option.casesOn none (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (term WalkingPair.right)

case some.right.some.right.id
C : Type u
inst✝ : Category.{v, u} C
W✝ X Y Z : C
f : X ⟶ Z
g : Y ⟶ Z
W : C
fst : W ⟶ X
snd : W ⟶ Y
eq : fst ≫ f = snd ≫ g
⊢ (((Functor.const WalkingCospan).obj W).map (WidePullbackShape.Hom.id (some WalkingPair.right)) ≫
      Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) =
    (Option.casesOn (some WalkingPair.right) (fst ≫ f) fun j' ↦ WalkingPair.casesOn j' fst snd) ≫
      (cospan f g).map (WidePullbackShape.Hom.id (some WalkingPair.right))