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

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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Question

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))

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