3维流形中的双侧可压缩曲面与薄形分解

对一个3维流形的任何一组彼此不相交的非过剩的双侧可压缩曲面集所含有的元素个数证明了是有上界的,记为N_0(M),记L_0(M)为M的薄形分解的长度,则有L_0(M)≤N_0(M)+|(■)M|,记L_0(V∪W)为M的Heegaard分解M=V∪W的薄形分解的长度,则对M的任意不可稳定化的Heegaard分解都有L_0(V∪W)≤N_0(W)+|(■)M|.

小3-流形中的双侧可压缩非Heegaard曲面

研究小3-流形中的双侧可压缩非Heegaard曲面,给出了这类曲面所具有的若干特殊的性质.

Incompressible Pairwise Incompressible Surfaces in Knot Exteriors

We discuss the properties of incompressible pairwise incompressible surfaces in a knot complement by using twist crossing number. Let K be a pretzel knot or rational knot that its twistindex is less than 6, and let F be an incompressible pairwise incompressible surface in S 3-K. Then F is a punctured sphere.