... for a class of even-order differential equationsQi-Ming Zhang∗1and Xiaofei He21College of Science, Hunan University of Technology, Zhuzhou,Hunan 412000, P.R. China2College of Mathematics ... a class of even-order differential equationsJournal of Inequalities and Applications 2012, 2012:5 doi:10.1186/1029-242X-2012-5Qi-Ming Zhang (zhqm20082008@sina.com)Xiaofei He (hexiaofei525@sina.com)ISSN ... (2.11)Since |x(c)| > 0, divided the last inequality of (2.11) by |x(c)|, we can obtain (2.10). By a similar method in the proof of Theorem 1.1, applying Lemmas 2.1 and 2.3, we canobtain...