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We classify 4-dimensional austere submanifolds in Euclidean space ruled by 2-planes. The algebraic possibilities for second fundamental forms of an austere 4-fold M were classified by Bryant, falling...
On Unimodality of Hilbert Functions of Gorenstein Artin Algebras of Embedding Dimension Four
Hilbert Functions Gorenstein Artin Algebras
2010/11/18
We prove that the Hilbert functions of codimension four graded Gorenstein Artin algebras R/I are unimodal provided I has a minimal generator in degree less than five. It is an open question whether al...
期刊信息
篇名
An invariant of link homotopy in dimension four
语种
英文
撰写或编译
撰写
作者
李贵松
第一作者单位
中国科学院系统科学研究所
刊物名称
Topology
页面
vol.36, pp.881-897
出版日期
1997年
月
日
文章标识(ISSN)
0040-9383
相关项目
代数拓扑与微分拓扑