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Alfredo Costa 《Journal of Pure and Applied Algebra》2007,209(2):517-530
For a pseudovariety of ordered semigroups, let be the class of sofic subshifts whose syntactic semigroup lies in . It is proved that if contains then is closed under taking shift equivalent subshifts, and conversely, if is closed under taking conjugate subshifts then contains and . Almost finite type subshifts are characterized as the irreducible elements of , which gives a new proof that the class of almost finite type subshifts is closed under taking shift equivalent subshifts. 相似文献
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The clustering coefficient of a scale-free random graph 总被引:2,自引:0,他引:2
N. Eggemann S.D. Noble 《Discrete Applied Mathematics》2011,159(10):953-965