(a) {(m, n) E N × N|m < n}. Hint: A subset of a countable set is countable. (b) {2 |n € N}. (c) {r E R| sin x = 0}.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter7: Real And Complex Numbers
Section7.1: The Field Of Real Numbers
Problem 3TFE: Label each of the following statements as either true or false. The least upper bound of a nonempty...
icon
Related questions
Question
4. Prove that the following sets are countably infinite.
(a) {(m, n) E N × N|m < n}. Hint: A subset of a countable set is countable.
(b) { \n € N}.
(c) {x € R| sinx = 0}.
Transcribed Image Text:4. Prove that the following sets are countably infinite. (a) {(m, n) E N × N|m < n}. Hint: A subset of a countable set is countable. (b) { \n € N}. (c) {x € R| sinx = 0}.
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Recommended textbooks for you
Elements Of Modern Algebra
Elements Of Modern Algebra
Algebra
ISBN:
9781285463230
Author:
Gilbert, Linda, Jimmie
Publisher:
Cengage Learning,
Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:
9781133382119
Author:
Swokowski
Publisher:
Cengage
Linear Algebra: A Modern Introduction
Linear Algebra: A Modern Introduction
Algebra
ISBN:
9781285463247
Author:
David Poole
Publisher:
Cengage Learning