关于π-左零半群的结构及其同余格

On the Structure of π-Left Zero Semigroups and Their Lattice of Congruences

通过研究π-左零半群的结构,利用所得的结论证明:若S是有限π-左零半群|E(s)|≤4,则C(S)是半模格。

In this paper,the author discusses the structure of π -left zero semi -groups, to prove that if S is a finite π -left zero semi - groups such that │E（s）│≤4 , then the lattice of congruences C（S） of S is a semi - modular lattice.