Mathematical Problems in Engineering
Volume 2010 (2010), Article ID 497029, 6 pages
Letter to the Editor

A Note on the Paper “Multipoint BVPs for Second-Order Differential Equations with Impulses” by Xuxin Yang, Zhimin He, and Jianhua Shen

School of Mathematics and Computer Science, Guangxi University for Nationalities, Nanning Guangxi 530006, China

Received 11 August 2010; Accepted 14 September 2010

Copyright © 2010 Yiliang Liu and Jitai Liang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We give a counter example to the comparison principle for the multipoint BVPs (by Xuxin Yang, Zhimin He, and Jianhua Shen, in Mathematical Problems in Engineering, Volume 2009, Article ID 258090, doi:10.1155/2009/258090). Then we suggest and prove a corrected version of the comparison principle.