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A Descriptive Approach to Language-Theoretic Complexity (Center for the Study of Language and Information - Lecture Notes)

ISBN: 9781575861364

出版社: Center for the Study of Language and Inf

出版年: 1998-06-01

定价: USD 27.00

装帧: Paperback

内容简介


Early formal specifications of natural language syntax were quite closely connected to the notion of abstract machines for computing them. More recently, this approach has been superseded by one in which languages are specified in terms of systems of constraints on the structure of their sentences. This has made complexity results difficult to obtain. This book introduces a way of obtaining such results. It presents a natural and quite general means of expressing constraints on the structure of trees and shows that the languages that can be specified by systems of such constraints are exactly those computable by a particular standard class of abstract machines. Thus the difficulty of processing a construction can be reduced to the difficulty of expressing the constraints that specify it.