On the rank of the certain orthodox semigroups
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摘要: 设~Xn={1,2,…,n}(n≥4) 是一个自然序集,Wn 是~Xn 上的保序压缩奇异变换半群,RWn是Wn的所有正则元构成的正则子半群.利用Green等价关系和蛋合图,证明了RWn的理想Ir={α∈RWn:∣imα∣≤r}(1≤r≤n−1) 秩为n−r+1.
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关键词:
- 秩
Abstract: Let Xn={1,2,…,n}(n≥4) be natural order set,Wn be semigroup of the order-preserving and compressing singular transformations on Xn,RWn be regular subsemigroup consisting of all regular elements in Wn.By Green equivalence and eggbox graph,we obtained that rank of ideals Ir={α∈RWn:∣imα∣≤r}(1≤r≤n−1) be n−r+1 .-
Keywords:
- rank
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