A generalized skewgradient system is proposed, and the generalized skewgradient representation for a Birkhoff system is studied. A condition under which the Birkhoff system can be considered as a generalized skewgradient system is obtained. The characteristic of generalized skewgradient system is then used to study the stability of the Birkhoff system. The application of this developed generalized skewgradient system is also presented through some case studies in this paper.
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梅凤翔,吴惠彬. Birkhoff系统的广义斜梯度表示[J].动力学与控制学报,2015,13(5):329~331; Mei Fengxiang, Wu Huibin. Generalized skew gradient representation for Birkhoff system[J]. Journal of Dynamics and Control,2015,13(5):329-331.