时间:2015年9月26日(星期六)下午15:00
地点:旗山校区理工北楼601报告厅
主办: 数学与计算机科学学院
主讲:浙江师范大学 夏永辉教授
专家简介:夏永辉,男,博士,教授。2012年7月-2013年7月在斯洛文尼亚Maribor大学访问学者,2015年7月-2016年12月澳门大学兼职研究人员。主要从事微分方程和动力系统领域的研究,研究方向包括微分方程的线性化理论、微分方程的周期解和稳定性、概周期微分方程、差分方程理论。近年来,主持国家自然科学基金2项、浙江省自然科学基金2项、欧盟研究基金项目1项。2009年获福建省科学技术奖三等奖1项(排名第一),2011年获浙江省科学技术奖一等奖1项(排名第三),2012年入选浙江省“新世纪151人才工程”(第二层次),2013年获“浙江省优秀科技工作者” 荣誉称号(全省共100名),2014年入选“中国高被引学者榜单”。
报告摘要:This paper establishes a systematic frame work for the theory of the linear quaternion-valued differential equations (QDES for short), which has many application to quantum mechanics, kinematic modelling and attitude dynamics, Kalmanfilter design, fluid mechanics, etc. Since quaternion does not communicate, left and right multiplications are different. Many concept and properties for the ordinary differential equations (ODES for short) cannot be used again. They should be redefined completely. A definition of Wronskian is defined which is different from standard one in the real or complex valued ordinary differential equations. Quaternionic-valued Liouville formulas are given. Also, it is necessary to treat the eigenvalue problem with left and right, separately. Based on these, we studied the solutions to the linear QDES. Furthermore, we present two algorithms for computing fundamental matrix. Some concrete examples are given to show the feasibility of the obtained algorithms. Finally, a conclusion and discussion ends the paper.