关键词: S-不变量 S-封闭基本有向回路簇 S-封闭基本有向贯通路簇 封闭重数

Abstract: A new method to find S-invariant for a net is presented in this paper. The basic idea of this method is to regard a net as a directed graph. By searching for S-closured basic directed transfixion path clusters or S-closured basic directed circuit clusters

Key words: S-invariant, S-closured basic directed circuit cluster, S-closured basic directed transfixion path cluster, Closure repetitive degree