“derivation sequence”的概念、定义、翻译、参考文献-科学参考

单词	derivation sequence
释义	derivation sequence Computer In formal language theory, a sequence of words of the form $w_{1} \Rightarrow w_{2} \Rightarrow \dots \Rightarrow w_{n}$ (for notation see semi-Thue system). For a context-free grammar, such a sequence is leftmost (or rightmost) if, $for each 1 \leq i \leq n,$ w_i₊₁ is obtained from w_i by rewriting the leftmost (or rightmost) nonterminal in w_i. Such sequences exist for all derivable words.
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