8. (a) Show that the intersection of finitely many open sets is open.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.2: Matrix Algebra
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8. (a) Show that the intersection of finitely many open sets is open.
28 Chapter 1 The Real Numbers
(b) Give an example showing that the intersection of infinitely many open sets
may fail to be open.
9. (a) Show that the union of finitely many closed sets is closed.
(b)
Give an example showing that the union of infinitely many closed sets may
fail to be closed.
10
Pique
Transcribed Image Text:8. (a) Show that the intersection of finitely many open sets is open. 28 Chapter 1 The Real Numbers (b) Give an example showing that the intersection of infinitely many open sets may fail to be open. 9. (a) Show that the union of finitely many closed sets is closed. (b) Give an example showing that the union of infinitely many closed sets may fail to be closed. 10 Pique
In Exercises 7 through 9, solve the linear system, with the
giver augmented matrix, if it is consistent.
1 1 10
7. (a)
1103
(b)
»
1
2 3 0
11:0
12:0
12 3 0
1 2 3 0
1 1 10
0
5
7 9:0
(d)
22
2
318]
Transcribed Image Text:In Exercises 7 through 9, solve the linear system, with the giver augmented matrix, if it is consistent. 1 1 10 7. (a) 1103 (b) » 1 2 3 0 11:0 12:0 12 3 0 1 2 3 0 1 1 10 0 5 7 9:0 (d) 22 2 318]
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