after giving some characterizations of left c a semigroups, the concept of pseudo spined product is to be defined and the new structure of left c a semigroup is to be given.
在给出左c -a半群的一些特性之后 ,定义了伪织积的概念 ,并给出了左c-a半群的一种新结构 。
a twisted spined product structure of a stratified band of monoids is given. by using this structure, a spined product structure of a proper band of monoids is obtained.