本刊英文版Vol.34(2018),No.1论文摘要（英文）

来源：数学学报(中文版), 2018, 61(02): 353-355.

<正>Non-hyperbolic Closed Characteristics on Non-degenerate Star-shaped Hypersurfaces in R2nHua Gui DUAN Hui LIU Yi Ming LONG Wei WANGAbstract In this paper,we prove that for every index perfect non-degenerate compact starshaped hypersurface∑(?)R2n,there exist at least n non-hyperbolic closed characteristics with even Maslov-type indices on E when n is even.When n is odd,there exist at least n closed