revert a₁ a₂
ℕ : Type
inst✝¹ : Natural ℕ
motive : Difference ℕ → Sort u
inst✝ : IndexedFamily motive
ctx : Induction.Context motive
a₁ a₂ : Difference ℕ
a_eqv : a₁ ≃ a₂
⊢ fsubst a_eqv (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
⊢ ∀ {a₁ a₂ : Difference ℕ} {a_eqv : a₁ ≃ a₂},
    fsubst a_eqv (Induction.Context.ind_diff ctx a₁) ≃ Induction.Context.ind_diff ctx a₂