Explain why

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 12E: 12. Find all homomorphic images of each group in Exercise of Section. 18. Let be the group of units...
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Explain why

Let G be a group, a EG. Prove that a= a
Con cept.
let G be a guroup 84ch that aEG
and
is inverse of a.
then
9.a
where
"e" is identity element o6 G
and
given
G be a goroup,
we have to Prove that
- 1
a = a'
Pororf:
kase I
let
if e =a
then e = é!
la1=lel=|
if e# a
then
a =
(: a«a'= e)
a.a =
a.a
Why 22
From 2
a
= e
Nothunderstand this
Step
la1= 2
thatis
lal<2
Let jal =1
%3D
then
e is only element of n
and
we know that
e
e =e
let
la1= 2
then
= e
9.a = e
but we knoo that
2
9.a
-
forom C) nd (2) we can say
a = a'
case 1 and
case 2, we have
forom
Transcribed Image Text:Let G be a group, a EG. Prove that a= a Con cept. let G be a guroup 84ch that aEG and is inverse of a. then 9.a where "e" is identity element o6 G and given G be a goroup, we have to Prove that - 1 a = a' Pororf: kase I let if e =a then e = é! la1=lel=| if e# a then a = (: a«a'= e) a.a = a.a Why 22 From 2 a = e Nothunderstand this Step la1= 2 thatis lal<2 Let jal =1 %3D then e is only element of n and we know that e e =e let la1= 2 then = e 9.a = e but we knoo that 2 9.a - forom C) nd (2) we can say a = a' case 1 and case 2, we have forom
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