Exercise 1. A set W of strings of symbols is defined recursively by a, b, and d belong to W. If x belongs to W, so does a(x)d. Provide 3 strings made of 3 letters each belonging to W and show the procedure used to obtain them. Provide 3 strings made of at least 5 letters each belonging to W and show the procedure used to obtain them.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Exercise 1.
A set of strings of symbols is defined recursively by

  1. ab, and d belong to W.
  2. If belongs to W, so does a(x)d.
  • Provide 3 strings made of 3 letters each belonging to W and show the procedure used to obtain them.
  • Provide 3 strings made of at least 5 letters each belonging to W and show the procedure used to obtain them.
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