Prove that each of the following sets, with the indicated operation, is an abelian group. (a) (R, *) with the operation x * y = x+y+c for each x, y € R, where c ER is a constant. xy (b) (R*, *) with the operation x * y = for each x, y ER*. 2 (c) (R \ {-1}, *) with the operation x * y = x + y + xy for each x, y ≤ R \ {-1}.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.7: Direct Sums (optional)
Problem 21E
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Prove that each of the following sets, with the indicated operation, is an abelian group.
(a) (R, *) with the operation x*y=x+y+c for each x, y € R, where c E R is a constant.
(b) (R*, *) with the operation x * y = for each x, y E R*.
xy
2
(c) (R \ {-1}, *) with the operation x * y = x + y + xy for each x, y ≤ R \ {-1}.
Transcribed Image Text:Prove that each of the following sets, with the indicated operation, is an abelian group. (a) (R, *) with the operation x*y=x+y+c for each x, y € R, where c E R is a constant. (b) (R*, *) with the operation x * y = for each x, y E R*. xy 2 (c) (R \ {-1}, *) with the operation x * y = x + y + xy for each x, y ≤ R \ {-1}.
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