∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {R : Type u_3} [inst_1 : NonUnitalSeminormedRing R]
  [inst_2 : NormedSpace 𝕜 R] [inst_3 : IsScalarTower 𝕜 R R] [inst_4 : SMulCommClass 𝕜 R R],
  ⇑(NonUnitalAlgHom.Lmul 𝕜 R) = ⇑(ContinuousLinearMap.mul 𝕜 R)