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For The a predicate necessarg 1-Some bodi 2- "Every +

For The a predicate necessarg 1-Some bodi 2- "Every +

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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For The a predicate necessarg 1-Some bodi 2- "Every +
Transcribed Image Text:For The a predicate necessarg 1-Some bodi 2- "Every +
Expert Solution
Step 1

Predicate:

It is a statement that contains variables.

Variable is predicate variable.

It may be true or false depending on the values of these
variables.

P(x) is Predicate.

Symbols:

1. for all - ∀

2. Belonging to - ∈

Given:

Some body knows more than two humans.

Explanation:

There exists a person knowing more than 2 humans

P(x,y): x knows more than y human

There exists x, such that

   P(x,2)

Formal way to say is

∋x∈P, P(x,2) is true

 

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