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6. Consider the following predicates defined over the domain of people: S(x): x is a student W(x): x works hard Now express the following expressions in English: (a) S(Natalie) (b) Vx. (S(x) ⇒ W(x)) (c) ExW(x) ⇒¬S(David) (d) 3x (S(x) ^ W(x))

6. Consider the following predicates defined over the domain of people: S(x): x is a student W(x): x works hard Now express the following expressions in English: (a) S(Natalie) (b) Vx. (S(x) ⇒ W(x)) (c) ExW(x) ⇒¬S(David) (d) 3x (S(x) ^ W(x))

Database System Concepts
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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Subject and Topic : Formal Specification Predicte Logic ( Quantifiers)

6. Consider the following predicates defined over the domain of people: S(x) x is a student W(x): x works hard Now express the following expressions in English: (a) S(Natalie) (b) Vx. (S(x) ⇒ W(x)) (c) Ex W(x) ⇒¬S(David) (d) 3!x (S(x)^ W(x))
Transcribed Image Text:6. Consider the following predicates defined over the domain of people: S(x) x is a student W(x): x works hard Now express the following expressions in English: (a) S(Natalie) (b) Vx. (S(x) ⇒ W(x)) (c) Ex W(x) ⇒¬S(David) (d) 3!x (S(x)^ W(x))
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