Given the following definitions: • S: the domain of all CPSC 121 students. • G: the domain of all graded CPSC 121 activities. • A(r, y): student r earns an "A" grade on activity y • B(x): student z receives a colourful balloon (from the CPSC 121 teaching team). Now consider the predicate logic statements: Statement 01: Vr E S, Vg E G, A(r, g) → B(r) Statement 02: Vr e S, (Vg EG, A(r, g)) +> B(x) Statement 03: Vr E S, (Vg EG, (Vy E S, A(y, g)) B(r) Describe how these statements differ, in terms of who receives a balloon and under what conditions.

Given the following definitions: • S: the domain of all CPSC 121 students. • G: the domain of all graded CPSC 121 activities. • A(r, y): student r earns an "A" grade on activity y • B(x): student z receives a colourful balloon (from the CPSC 121 teaching team). Now consider the predicate logic statements: Statement 01: Vr E S, Vg E G, A(r, g) → B(r) Statement 02: Vr e S, (Vg EG, A(r, g)) +> B(x) Statement 03: Vr E S, (Vg EG, (Vy E S, A(y, g)) B(r) Describe how these statements differ, in terms of who receives a balloon and under what conditions.

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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Concept explainers

Predicates

A predicate is a function defined with set of variables, which returns the result True or False. The output of a predicate is a Boolean value as a response when given a set of parameters:

Question

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Given the following definitions:
• S: the domain of all CPSC 121 students.
• G: the domain of all graded CPSC 121 activities.
A(r, y): student r earns an "A" grade on activity y
B(1): student a receives a colourful balloon (from the CPSC 121 teaching team).
Now consider the predicate logic statements:
Statement 01: Vr E S, Vg E G, A(r, g) +> B(x)
Statement (02: Vr E S, (Vg EG, A(r, g)) + B(r)
Statement 03: Vr E S, (Vg e G, (Vy E S, A(y, 9))) > B(x)
Describe how these statements differ, in terms of who receives a balloon and under what
conditions.

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