Exercise 7.3.2. Let G be the set of subsets of the set {a,b, c}. (a) Does the set G with the operation U have the closure property? Justify your answer. (b) Does the set G with the operation U have an identity? If so, what is it? Which part of Proposition 7.2.3 enabled you to draw this conclusion? (c) Is the operation U defined on the set G associative? Which part of Proposition 7.2.3 enabled you to draw this conclusion?
Exercise 7.3.2. Let G be the set of subsets of the set {a,b, c}. (a) Does the set G with the operation U have the closure property? Justify your answer. (b) Does the set G with the operation U have an identity? If so, what is it? Which part of Proposition 7.2.3 enabled you to draw this conclusion? (c) Is the operation U defined on the set G associative? Which part of Proposition 7.2.3 enabled you to draw this conclusion?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Proposition 7.2.3. Let A, B, and C be subsets of a universal set U. Then
1. AUA' = U and AnA' = 0
2. AUA = A, An A = A, and A \ A = 0;
3. AUØ = A and An0 = 0;
4. AUU = U and ANU = A;
5. AU(BUC) = (AUB)UC and An (BnC) = (An B)nC;
6. AUB = BU A and An B = BN ;
7. AU(BNC) = (AUB)N(AUC) and (BNC)UA= (BUA)N(CUA);
8. An(BUC) = (ANB)U(ANC) and (BUC)NA= (BNA) U (CN A).
Transcribed Image Text:Exercise 7.3.2. Let G be the set of subsets of the set {a, b, c}.
(a) Does the set G with the operation U have the closure property? Justify
your answer.
(b) Does the set G with the operation U have an identity? If so, what is it?
Which part of Proposition 7.2.3 enabled you to draw this conclusion?
(c) Is the operation U defined on the set G associative? Which part of
Proposition 7.2.3 enabled you to draw this conclusion?
(d) Is the operation U defined on the set G commutative? Which part of
Proposition 7.2.3 enabled you to draw this conclusion?
(e) Does each element of G have a unique inverse under the operation U? If
so, which part of Proposition 7.2.3 enabled you to draw this conclusion?
If not, provide a counterexample.
(f) Is the set G a group under the U operation? Justify your answer.
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