English
Two natural transformations between quotient-functor compositions are equal if their whiskerings with Quotient.functor coincide.
Русский
Две естественные отображения между композициями функторов Quotient равны, если их проекцирование через Quotient.functor совпадают.
LaTeX
$$$\forall F,G : Quotient(r) \to D,\; \tau_1,\tau_2 : F \Rightarrow G,\; (\mathrm{whiskerLeft} (\mathrm{Quotient.functor}\ r)\tau_1 = \mathrm{whiskerLeft} (\mathrm{Quotient.functor}\ r)\tau_2) \Rightarrow \tau_1 = \tau_2.$$$
Lean4
theorem lift_spec : functor r ⋙ lift r F H = F := by tauto