... properties of E with the help of EC. Without loss of generality, we can deal only with the positive solutions of E. Since every solution of Eis also a solution of EC, we are in view of ... satisfiesD0, and then from the first two inequalities of D0, we have the information only about thezero and the first derivative of yt. We have no information about the second and the thirdderivatives, ... techniques appeared for the investigation of such equations. Some of them 1, 19make use of the methods developed for the second-order equations 16, 17, 20 like theRiccati transformation and the...