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半群V(n,r)的幂等元秩 被引量:3

On the idempotent ranks of the semigroup V(n,r)
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摘要 设SPCn是[n]上的降序且保序严格部分变换半群。对n≥5和3≤r≤n-2,证明了半群V(n,r)={α∈SPCn:|lim(α)|≤r}是幂等元生成的,且它的秩和幂等秩均为sum from n-1 to k=r((nk)(k-1 r-1))。 Let SPCn be the semigroup of all strictly decreasing and order-preserving partial transformations on [n].For n≥5 and 2≤r≤n-2,we show that the subsemigroup V(n,r)={α∈SPCn:|im(α)|≤r} is idempotent-generated,with both rank and idempotent rank are equal to sum from n-1 to k=r((nk)(k-1 r-1)).
作者 赵平
出处 《山东大学学报(理学版)》 CAS CSCD 北大核心 2012年第2期78-81,共4页 Journal of Shandong University(Natural Science)
基金 贵州省科学技术基金项目(黔科合[2010]3174)
关键词 变换半群 降序 保序 幂等元秩 transformation semigroup decreasing order-preserving idempotent rank rank
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参考文献6

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二级参考文献8

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