∀ {α : Type u_1} {R : Type u_2} [inst : TopologicalSpace α] [inst_1 : PseudoMetricSpace R] [inst_2 : Semiring R]
  [inst_3 : BoundedMul R] [inst_4 : ContinuousMul R] [inst_5 : BoundedAdd R] [inst_6 : ContinuousAdd R]
  (a b c : BoundedContinuousFunction α R), a * b * c = a * (b * c)