Comment on bounds on time-correlation functions via the infinite-order maclaurin expansion

The method recently proposed by Alien and Diestler for obtaining bounds to time-autocorrelation functions is not (as claimed by the authors) equivalent to the method of Platz and Gordon, nor does it provide bounds at all times. It is instead equivalent to the method of Cukier and Wheeler based on gaussian quadratures. The quadratures are preferable to the approximate summation of the Maclaurin series.