Inessential Features
Inessential Features
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不必要的功能
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Kracht
中科院分区：
文献类型：
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作者：
M. Kracht
如果将表面过滤器转换为上下文无关的规则，则必须引入新的特征。这些特征是严格非词汇的，它们的分布可以从词汇特征的分布中预测。现在，给定一个（基于特征的）上下文无关语法，我们问是否可以识别非词汇特征。这是不可能的;然而，非本质特征的概念是一种近似。为了得到一种描述性的语言理论，我们需要消除所有不重要的特征。人们可以通过确定非本质特征分布所需公式的复杂性来衡量一种语言的复杂性。
If one converts surface lters into context free rules, one has to introduce new features. These features are strictly nonlexical, and their distribution is predictable from the distribution of the lexical features. Now, given a (feature based) context free grammar, we ask whether one can identify the nonlexical features. This is not possible; however, the notion of an inessential feature ooers an approximation. To arrive at a descriptive theory of language one needs to eliminate all the inessential features. One can measure the complexity of a language by the complexity of the formulae needed to deene the distribution of inessential features.