A. Show that each of the following is not a group. (Hint: identify and show the group property that is not satisfied). 1) * defined on Z by a * b = la + b| 2) • defined on Q by a • b = * 3) * defined on R by a i a+b b a+b- ab

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.6: Quotient Groups
Problem 13E
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A. Show that each of the following is not a group. (Hint: identify and show the group
property that is not satisfied).
1) * defined on Z by a * b = la + b|
2) * defined on Q by a + b = *
3) * defined on R by a • b = a + b – ab
a+b
Transcribed Image Text:A. Show that each of the following is not a group. (Hint: identify and show the group property that is not satisfied). 1) * defined on Z by a * b = la + b| 2) * defined on Q by a + b = * 3) * defined on R by a • b = a + b – ab a+b
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