have od_subst : od₁ ≃ fsubst ‹d₂ ≃ d₁› od₂ := Rel.symm ctx.on_diff_subst
ℕ : Type
inst✝¹ : Natural ℕ
motive : Difference ℕ → Sort u
inst✝ : IndexedFamily motive
ctx : Induction.Context motive
n₁ m₁ n₂ m₂ : ℕ
a₁ : Difference ℕ := n₁——m₁
a₂ : Difference ℕ := n₂——m₂
x✝ : a₁ ≃ a₂
d₁ : Difference ℕ := n₁——0 - m₁——0
d₂ : Difference ℕ := n₂——0 - m₂——0
this✝² : d₁ ≃ a₁
this✝¹ : d₂ ≃ a₂
this✝ : d₁ ≃ a₂
this : d₂ ≃ d₁
od₁ : motive (Coe.coe n₁ - Coe.coe m₁) := Induction.Context.on_diff n₁ m₁
od₂ : motive (Coe.coe n₂ - Coe.coe m₂) := Induction.Context.on_diff n₂ m₂
⊢ fsubst x✝ (Induction.Context.ind_diff ctx a₁) ≃ Induction.Context.ind_diff ctx a₂
ℕ : Type
inst✝¹ : Natural ℕ
motive : Difference ℕ → Sort u
inst✝ : IndexedFamily motive
ctx : Induction.Context motive
n₁ m₁ n₂ m₂ : ℕ
a₁ : Difference ℕ := n₁——m₁
a₂ : Difference ℕ := n₂——m₂
x✝ : a₁ ≃ a₂
d₁ : Difference ℕ := n₁——0 - m₁——0
d₂ : Difference ℕ := n₂——0 - m₂——0
this✝² : d₁ ≃ a₁
this✝¹ : d₂ ≃ a₂
this✝ : d₁ ≃ a₂
this : d₂ ≃ d₁
od₁ : motive (Coe.coe n₁ - Coe.coe m₁) := Induction.Context.on_diff n₁ m₁
od₂ : motive (Coe.coe n₂ - Coe.coe m₂) := Induction.Context.on_diff n₂ m₂
od_subst : od₁ ≃ fsubst this od₂
⊢ fsubst x✝ (Induction.Context.ind_diff ctx a₁) ≃ Induction.Context.ind_diff ctx a₂