2.29. Let A = [a1, a2] and B = [b, b] be closed and bounded intervals in R. In each of the following groups determine which of the four possible intersection values can be realized and which cannot for A and B in R. Depict those that can be realized and prove that the remainder cannot. (a) (0,0, 0, 0), (1, 0, 0, 0), (0, 1, 0, 0), (1, 1, 0, 0) (b) (0, 0, 1, 0), (1,0, 1, 0), (0, 1, 1, 0), (1, 1, 1, 0) (c) (0,0,0, 1), (1,0,0, 1), (0, 1, 0, 1), (1, 1, 0, 1) (d) (0,0, 1, 1), (1,0, 1, 1), (0, 1, 1, 1), (1, 1, 1, 1)

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.4: Cyclic Groups
Problem 11E: Exercises 11. According to Exercise of section, if is prime, the nonzero elements of form a...
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Exercises for Section 2.4
2.29. Let A = [a1, az] and B = [b1, b2] be closed and bounded intervals in R. In
each of the following groups determine which of the four possible intersection
values can be realized and which cannot for A and B in R. Depict those that
can be realized and prove that the remainder cannot.
(a) (0,0, 0, 0), (1,0, 0, 0), (0, 1, 0, 0), (1, 1, 0, 0)
(b) (0, 0, 1, 0), (1, 0, 1, 0), (0, 1, 1, 0), (1, 1, 1, 0)
(c) (0, 0, 0, 1), (1, 0, 0, 1), (0, 1, 0, 1), (1, 1, 0, 1)
(d) (0, 0, 1, 1), (1,0, 1, 1), (0, 1, 1, 1), (1, 1, 1, 1)
2.30. Let A and B be closed sets in a topological space X.
(a) Prove that if IA,B = (0,0, 0, 0), then AnB = Ø.
(b) Prove that if IA.B = (1,0, 0, 0), then An B = 3AN3B.
(c) Prove that if IA,B (1, 1, 1, 1) or (0, 1, 1, 1), then Int(A) N Int(B) # Ø,
A¢ B, and B¢ A.
Transcribed Image Text:Exercises for Section 2.4 2.29. Let A = [a1, az] and B = [b1, b2] be closed and bounded intervals in R. In each of the following groups determine which of the four possible intersection values can be realized and which cannot for A and B in R. Depict those that can be realized and prove that the remainder cannot. (a) (0,0, 0, 0), (1,0, 0, 0), (0, 1, 0, 0), (1, 1, 0, 0) (b) (0, 0, 1, 0), (1, 0, 1, 0), (0, 1, 1, 0), (1, 1, 1, 0) (c) (0, 0, 0, 1), (1, 0, 0, 1), (0, 1, 0, 1), (1, 1, 0, 1) (d) (0, 0, 1, 1), (1,0, 1, 1), (0, 1, 1, 1), (1, 1, 1, 1) 2.30. Let A and B be closed sets in a topological space X. (a) Prove that if IA,B = (0,0, 0, 0), then AnB = Ø. (b) Prove that if IA.B = (1,0, 0, 0), then An B = 3AN3B. (c) Prove that if IA,B (1, 1, 1, 1) or (0, 1, 1, 1), then Int(A) N Int(B) # Ø, A¢ B, and B¢ A.
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