Let B={0,1}, N={0, 1, 2,…}. B^n(n∈N), B~* and B~∞ are as usual. For x∈B~* ∪B~∞ we denote by x^n the initial segment of x with the length n and by x_m^n the word consisting
文摘Let B={0,1}, N={0, 1, 2,…}. B^n(n∈N), B~* and B~∞ are as usual. For x∈B~* ∪B~∞ we denote by x^n the initial segment of x with the length n and by x_m^n the word consisting
