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
中科院分区:
文献类型:
--
作者:
Miller C
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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