Ehresmann monoids: Adequacy and expansions
Ehresmann monoids: Adequacy and expansions
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埃雷斯曼幺半群:充分性和扩展
DOI:
10.1016/j.jalgebra.2018.06.036
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发表时间:
2018-11
影响因子:
0.9
通讯作者:
Yanhui Wang
中科院分区:
文献类型:
--
作者:
Mario J.J. Branco;Gracinda M.S. Gomes;Victoria Gould;Yanhui Wang
It is known that an Ehresmann monoid P (T, Y) may be constructed from a monoid T acting via order-preserving maps on both sides of a semilattice Y with identity, such that the actions satisfy an appropriate compatibility criterion. Our main result shows that if T is cancellative and equidivisible (as is the case for the free monoid X⁎), the monoid P (T, Y) not only is Ehresmann but also satisfies the stronger property of being adequate. Fixing T, Y and the actions, we characterise P (T, Y) as being unique in the sense that it is the initial object in a suitable category of Ehresmann monoids. We also prove that the operator P defines an expansion of Ehresmann monoids.
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