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Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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
Transcribed Image Text:Each case below gives a recursive definition of a subset L of {a, b}". Give a simple non-recursive
definition of L in each case.
a. a E L; for any x E L, xa and xb are in L.
b. a E L; for any x E L, bx and xb are in L.
c. a E L; for any xEL, ax and xb are in L.
d. a E L; for any x E L, xb, xa, and bx are in L.
e. a E L; for any xE L, xb, ax, and bx are in L.
f. a E L; for any x E L, xb and xba are in L.
Hint: The non-recursive definition of the language listed at point a may be given as: "the set of all
strings beginning with a."
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