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Bipartite graphs and completely 0-simple semigroups

机译:二部图和完全0-简单半群

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摘要

In a manner similar to the construction of the fundamental group of a connected graph, this article introduces the construction of a fundamental semigroup associated with a bipartite graph. This semigroup is a 0-direct union of idempotent generated completely 0-simple semigroups. The maximal nonzero subgroups are the corresponding fundamental groups of the connected components. Adding labelled edges to the graph leads to a more general completely 0-simple semigroup. The basic properties of such semigroups are examined and they are shown to have certain universal properties as illustrated by the fact that the free completely simple semigroup on n generators and its idempotent generated subsemigroup appear as special cases.
机译:以类似于连接图基本组的构造的方式,本文介绍了与二部图关联的基本半组的构造。这个半群是完全生成0个简单半群的幂等数的0直接联合。最大非零子组是所连接组件的相应基本组。将标记的边添加到图形会导致更通用的完全为0的简单半群。检验了这类半群的基本性质,并证明它们具有一定的通用性质,这一事实说明了n个生成器上的自由完全简单半群及其幂等生成的次半群是特例。

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