A pumping lemma for DLI-languages

A pumping lemma for DLI-languages
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DOI:
10.1016/s0012-365x(02)00265-0
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发表时间:
2002-12-06
影响因子:
0.8
通讯作者:
K치szonyi, L
K치szonyi, L
中科院分区:
数学3区
文献类型:
--
作者:
K치szonyi, L

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分层线性集在Ginsburg(The Mathematical Theory of Context-Free Languages,McGraw-Hill,纽约,1966)提出的有界上下文无关语言理论中起着核心作用。“触发器引理”(Pure Math.Appl.Ser.A6(2)(1995)203)指出,向量集{(e(0),...,e(m-1))是N(m)\delta(0)e(0)+(...)+的元素。delta(m-1)e(m-1)不等于0},其中delta(i)是{-1,0,1}的元素,对于i = 0,...,m - 1,N表示非负整数的集合,是分层半线性集合,即,分层线性集合的有限并集。在本文中,我们推广了引理的陈述,给出了DLI-集的一个充分必要条件(即,对于由线性不等式定义的向量集)是分层半线性的。(C)2002 Elsevier Science B. V.保留所有权利。
Stratified linear sets play a central role in the theory of bounded context-free languages, developed by Ginsburg (The Mathematical Theory of Context-Free Languages, McGraw-Hill, New York, 1966). The "Flip-Flop Lemma," (Pure Math. Appl. Ser. A 6(2) (1995) 203), states, that the vector-set{(e(0),...,e(m-1)) is an element ofN(m) \delta(0)e(0) +(...)+ delta(m-1)e(m-1) not equal 0}where delta(i)is an element of {-1,0, 1}, for i = 0,...,m - 1, and N denotes the set of non-negative integers, is a stratified semilinear set, i.e., a finite union of stratified linear sets. In this paper, we generalize the statement of the lemma giving a necessary and sufficient condition for a DLI-set (i.e., for a vector-set Defined by Linear Inequalities) to be stratified semilinear. (C) 2002 Elsevier Science B.V. All rights reserved.