EBK CONCEPTS OF PROGRAMMING LANGUAGES
EBK CONCEPTS OF PROGRAMMING LANGUAGES
12th Edition
ISBN: 9780135102251
Author: Sebesta
Publisher: VST
Expert Solution & Answer
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Chapter 4, Problem 20RQ

Explanation of Solution

Simple phrase of a sentential form:

Phrase in a parse tree is the string of terminals collected from the leaves of the partial parse tree, rooted at one specific internal node in the original parse tree.

  • A simple phrase is a phrase which is derived in one single step from a nonterminal node.
  • Simple phrases are subsets of a phrase.
  • β is a simple phrase in the right sentential form γ if and only if S*γ, where, γ= α12 and α1

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