∀ (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] [RegularNormedAlgebra 𝕜 R]
  (x : R), ‖(ContinuousLinearMap.mul 𝕜 R) x‖₊ = ‖x‖₊