双分支链环的Link数

摘要

If L be link with two components and S1,S2,…Sn a switching sequence suhc that SnSn-1…S1L is unlinked.It is proved that lk(L)=∑i-1^n εi(L)and then we obtained result that any link L can be transformed a n-twisting Ln by switching some crossing 1,2,…，m,lk(L)=∑i=1^n εi C(EiL)+n.