In this paper used position space renormalization group method calculated critical index of threecornered lattice of majority layter. and discussed the affect of anisotropy to critical index.
本文用实空间重整化群方法，计算了层状三角形晶格点阵的临界指数，并讨论了各向异性对临界指数的影响。
2
In chapter 2, the connection and combination of rough sets and other mathematical subjects, such as fuzzy sets, measure, integral, lattice, group, are researched.
第二章，主要研究了粗糙集与模糊集、测度、积分、格、群的关系和结合。
3
In this paper, We have proved a group of recursive formulas, which are used for Computing Probability of blast at point in lattice blasting network. Finally, exhibit Compute result of a example.