riend
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
Suppose you are given some facts in First-Order Logics:
a) Andi is a professor
b) All professors are people.
c) Ani is the dean.
d) All Deans are professors.
e) All professors consider the dean a friend or don’t know him.
f) Everyone is a friend of someone.
g) People only criticize people that are not their friends.
h) Andi criticized Ani.
Prove that: Ani is not Andi’s friend.
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