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Generating all permutations by context-free grammars in Chomsky normal form

机译:通过Chomsky范式的上下文无关文法生成所有排列

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摘要

Let L{sub}n be the finite language of all n! strings that are permutations of n different symbols (n≥1). We consider context-free grammars G{sub}n in Chomsky normal form that generate L{sub}n. In particular we study a few families {G{sub}n}{sub}n≥1, satisfying L(G{sub}n) = L{sub}n for n ≥ 1, with respect to their descriptional complexity, i.e. we determine the number of nonterminal symbols and the number of production rules of G{sub}n as functions of n.
机译:令L {sub} n为所有n的有限语言!由n个不同符号(n≥1)排列而成的字符串。我们考虑以Chomsky范式形式生成G {sub} n的无上下文语法G {sub} n。特别是,我们研究了几个家庭{G {sub} n} {sub}n≥1,满足n(≥1)满足L(G {sub} n)= L {sub} n的描述复杂性,即确定非终止符号的数量和G {sub} n的生成规则的数量作为n的函数。

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