**Exercise 4:**- R1 = \{(a, b) ∈ ℝ² | a > b\}, the "greater than" relation.- R2 = \{(a, b) ∈ ℝ² | a ≥ b\}, the "greater than or equal to" relation.- R3 = \{(a, b) ∈ ℝ² | a < b\}, the "less than" relation.- R4 = \{(a, b) ∈ ℝ² | a ≤ b\}, the "less than or equal to" relation.- R5 = \{(a, b) ∈ ℝ² | a = b\}, the "equal to" relation.- R6 = \{(a, b) ∈ ℝ² | a ≠ b\}, the "unequal to" relation.a) Find R1 ∪ R3.b) Find R1 − R2.

Notations used X U Y It implies that all values either exist in X or in Y. It is known as UNION…

Answered: a) R1 U R3. b) R1 – R2.

Engineering

Computer Science

a) R1 U R3. b) R1 – R2.

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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