Journal of Applied Mathematics
Volume 2012 (2012), Article ID 361961, 11 pages
Research Article

Limit Circle/Limit Point Criteria for Second-Order Superlinear Differential Equations with a Damping Term

1School of Electrical Engineering and Automation, Qufu Normal University, Rizhao, Shandong 276826, China
2The Thirteen Middle School of Jining, Jining 22100, China

Received 6 September 2011; Revised 13 December 2011; Accepted 18 December 2011

Academic Editor: PGL Leach

Copyright © 2012 Lihong Xing et al. 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.


The purpose of the present paper is to establish some new criteria for the classifications of superlinear differential equations as being of the nonlinear limit circle type or of the nonlinear limit point type. The criteria presented here generalize some known results in literature.