Let Σ = {a, b, c}, let L1 be the set of all the strings over Σ which have the same number of a’s, b’s and c’s, and let L2 the set of strings of Σ where all the a’s precede all the b’s and all the b’s precede all the c’s. What is: (a) L1 ∩ L2? (b) L1 ∪ L2? (c) L1? (d) L2? (e) L1 ⊕ L2?
Let Σ = {a, b, c}, let L1 be the set of all the strings over Σ which have the same number of a’s, b’s and c’s, and let L2 the set of strings of Σ where all the a’s precede all the b’s and all the b’s precede all the c’s. What is: (a) L1 ∩ L2? (b) L1 ∪ L2? (c) L1? (d) L2? (e) L1 ⊕ L2?
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
Problem 1PE
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Let Σ = {a, b, c}, let L1 be the set of all the strings over Σ which have the same number of
a’s, b’s and c’s, and let L2 the set of strings of Σ where all the a’s precede all the b’s and
all the b’s precede all the c’s. What is:
(a) L1 ∩ L2?
(b) L1 ∪ L2?
(c) L1?
(d) L2?
(e) L1 ⊕ L2?
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