Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-09-01

Journal: MATHEMATISCHE NACHRICHTEN

Included Journals: SCIE、Scopus

Volume: 284

Issue: 13

Page Number: 1669-1677

ISSN: 0025-584X

Key Words: Second order system; Ahmad-Lazer-Paul type condition; saddle point theorem

Abstract: We investigate the existence of periodic solutions of differential systems with a skew-symmetric matrix term and unbounded nonlinearities. Under new generalized Ahmad-Lazer-Paul conditions, some existence results are obtained and some results in the literature are improved. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim