Generators and presentations for direct and wreath products of monoid acts

Generators and presentations for direct and wreath products of monoid acts
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幺半群行为的直接积和花圈积的生成器和演示

DOI:
10.1007/s00233-018-9987-5
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发表时间:
2018
期刊:
影响因子:
0.7
通讯作者:
Miller C
Miller C
中科院分区:
数学3区
文献类型:
--
作者:
Miller C

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我们研究在么半群系的直积和圈积下有限生成和有限表示的性质的保持性。称么半群在直积中保持性质,如果对任何两个M-动作A和B,直积是性质当且仅当A和B都有性质。证明了保有限世代的么半群M(?)有限可表示性)的直积正是对其有限生成对角M-Actity的那些(分别.有限地呈现)。证明了一个圈积是有限生成的当且仅当A和B都是有限生成的。证明了有限表示的必要条件是A和B都是有限表示的。最后,给出了圈积有限表示的几个充分条件。
We investigate the preservation of the properties of being finitely generated and finitely presented under both direct and wreath products of monoid acts. A monoidMis said topreservepropertyin direct products if, for any twoM-actsAandB, the direct producthas propertyif and only if bothAandBhave property. It is proved that the monoidsMthat preserve finite generation (resp. finitely presentability) in direct products are precisely those for which the diagonalM-actis finitely generated (resp. finitely presented). We show that a wreath productis finitely generated if and only if bothAandBare finitely generated. It is also proved that a necessary condition forto be finitely presented is that bothAandBare finitely presented. Finally, we find some sufficient conditions for a wreath product to be finitely presented.
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