Abstract： Bipartite graphs with P-regular endomorphism monoids are characterized.P-regularity of the endomorphism monoid of lexicographic product of graphs is discussed.

摘要 ：刻划了具有P-正则自半群的二分图，讨论了字典序积图的自半群的P-正则.

This paper establishes a global attractor of hemigroup produced by the initial boundary value problem of generalized convection and expansion equation.

从动力系统,立了广义对流扩散方程初边值问题所产生半群的一个全局吸引子。

It proves that the posterior probability about experiments makes up hemigroup then proves that the posterior probability of the order experiments and the accumulation experiments are the same.

证明了后验概率关于试验构成半群,从而序贯试验与累积试验具有相的后验概率。