“…The classical Lyapunov inequality [23] is related to the second order linear differential equation Inequality (1.5) has found many practical applications in the theory of differential equations (see, for example, [2,5,22,32,34] and the references therein). For more improvements and generalizations of (1.5), we refer to [1,4,6,10,13,24,[28][29][30]33] and the references therein. On the other hand, due to the great attention which has been given in these last years to fractional calculus, several results related to the study of Lyapunovtype inequalities for fractional differential equations were obtained.…”