The quasi-idempotent of partial order-preserving transformation
WU Jiang-ya · Journal of Northeast Normal University · 2015
Let POnbe the partial order-preserving semigroup on [n].It is shown that for n≥3,the number of quasi-idempotent of rank n-1of POnis 4n-6,at the same time,we also prove that the semigroup POnis quasi-idempotent generated,with the rank is 2n-1.