Supported by National Natural Science Foundation of China (Grant No. 10971086);Mathematical Tianyuan Foundation of China (Grant No. 11126186);Natural Science Foundation of Gansu Province (Grant No.1107RJZA218);Fundamental Research Funds for Central Universities (Grant No. lzujbky-2012-12)
Let X* be a free monoid over an alphabet X and W be a finite language over X. Let S(W) be the Rees quotient X*/I(W), where I(W) is the ideal of X* consisting of all elements of X* that are not subwords of W....
supported by National Natural Science Foundation of China(Grant Nos. 10571077,10971086)
In this paper, the half-strong, the locally strong and the quasi-strong endomorphisms of a split graph are investigated. Let X be a split graph and let End(X), hEnd(X), 1End(X) and qEnd(X) be the endomorphism ...