“…Proof: Observe that (10a-d) is similar to the target system already investigated in the proof of Theorem 1 in [7]. While only parallel transport equations are considered in [7], (10a-b) is a set of cascaded transport equations, which, however, does not change the result. Hence, the states ε− (t) = {ε − (z, t), z ∈ [0, 1]} and w(t) = { w(z, t), z ∈ [0, 1]} are piecewise continuous and thus bounded on [0, D − ].…”