摘要
对若干的(n,r),我们证明了π_n(s ̄r)≠0,并估计了非零元的阶;得到了一个判断球的同伦群是非零的充分条件,确定了某些同纬像同态的核.
In this paper,we prove that π_n(s ̄r)≠0 for some(n, r);estimate the orders of the non-zero elements; obtain a sufficient condition to conclude the homotopy groups of spheres to be non zero; determine the kernels of some suspeusion homomorphisms.
出处
《数学杂志》
CSCD
北大核心
1994年第1期23-27,共5页
Journal of Mathematics
关键词
同伦群
同纬像同态
正合同伦序列
homotopy group of sphere
Whitehad product
suspension hom-omorphism
homotopy exact sequenec.