Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Exercise 1.6.4: Truth values for quantified statements for a given set of predicates.
The domain for this problem is a set {a,b,c,d}. The table below shows the value of three predicates for each of the elements in the domain. For example, Q(b) is false because the truth value in row b, column Q is F.
P | Q | R | |
a | T | T | F |
b | T | F | F |
c | T | F | F |
d | T | F | F |
Which statements are true? Justify your answer.
(d)
∃x Q(x)
(e)
∀x R(x)
(f)
∃x R(x)
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