段华贵,男,南开大学数学科学学院副教授,研究方向是非线性分析. 发表文章及著作发表文章及著作: Huagui Duan, Yiming Long, Multiple closed geodesics on bumpy Finsler n-spheres. J. Differential Equations. 233 (2007), 221-240. Huagui Duan, Yiming Long, Multiplicity and stability of closed geodesics on bumpy Finsler 3-spheres. Calc. Var. & Partial Differential Equations. 31 (2008), 483-496. Yiming Long, Huagui Duan, Multiple closed geodesics on 3-spheres. Advances in Mathematics, 221 (2009), 1757-1803. Huagui Duan, Yiming Long, The index growth and multiplicity of closed geodesics. J. Funct. Anal. 259 (2010), 1850-1913.发表文章及著作发表文章及著作: Huagui Duan, Yiming Long, Multiple closed geodesics on bumpy Finsler n-spheres. J. Differential Equations. 233 (2007), 221-240. Huagui Duan, Yiming Long, Multiplicity and stability of closed geodesics on bumpy Finsler 3-spheres. Calc. Var. & Partial Differential Equations. 31 (2008), 483-496. Yiming Long, Huagui Duan, Multiple closed geodesics on 3-spheres. Advances in Mathematics, 221 (2009), 1757-1803. Huagui Duan, Yiming Long, The index growth and multiplicity of closed geodesics. J. Funct. Anal. 259 (2010), 1850-1913.