∀ {R : Type u_3} {P : Type u_1} {S : Type u_2} [inst : CommRing R] [inst_1 : CommRing P] [inst_2 : CommRing S]
  [inst_3 : Algebra R P] [inst_4 : Algebra P S]
  (l : { l // l ∘ₗ KaehlerDifferential.kerToTensor R P S = LinearMap.id }),
  ↑l ∘ₗ KaehlerDifferential.kerToTensor R P S = LinearMap.id