“…In closing, we thank the referee for pointing out that the authors of [2] have shown that, for a function φ that is continuously differentiable on (0, 1], has a monotone derivative, and satisfies lim t→0 + φ(t) = ±∞, the additional condition of lim t→0 + tφ (t) being finite guarantees that the right-hand derivative lim…”