O) be the smallest ideal of R that contains a. I6 Ris a commulative Ring uith unity , show That =aR=Lar Ik €R).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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<as be the smallest ideal of R that contains a.
If Ris a commūlative Ring wieth unity , show That
<a> = aR= Lar Ie ER) .
PHOof:
let <a> = nfu: Uis a ideal of R and af u}
Ueauly, <a) is the smallest ideal ewhich contains a.
We shall shou that ca> = aR
Since ar is and ideal and af aR,
have
<a> c aR
Let U be any ideal of R suh that a E U
Fore any
Hence aR CU. Since U is an arebitkary ideal containing
a it follows that
Ra e
te ER, weOe are EU by definition of
an ideal.
aRCn {u:U is
aR c co)
a eu)
an ideal
of t
an a
Hence,
Hence, From O and we
get
that
くa>= aR
without
Example: 22-f2k:K €Z} is a commūlative king merith unity.
,><2> = { 2° : mis an integer)
a = 2 € 2Z
2 (22)
= 2Z
f2k: KE Z}
%3D
aR =
6 ¢ <2>
but
6 € 22
Hene,
<2) + 2 (22)
Transcribed Image Text:<as be the smallest ideal of R that contains a. If Ris a commūlative Ring wieth unity , show That <a> = aR= Lar Ie ER) . PHOof: let <a> = nfu: Uis a ideal of R and af u} Ueauly, <a) is the smallest ideal ewhich contains a. We shall shou that ca> = aR Since ar is and ideal and af aR, have <a> c aR Let U be any ideal of R suh that a E U Fore any Hence aR CU. Since U is an arebitkary ideal containing a it follows that Ra e te ER, weOe are EU by definition of an ideal. aRCn {u:U is aR c co) a eu) an ideal of t an a Hence, Hence, From O and we get that くa>= aR without Example: 22-f2k:K €Z} is a commūlative king merith unity. ,><2> = { 2° : mis an integer) a = 2 € 2Z 2 (22) = 2Z f2k: KE Z} %3D aR = 6 ¢ <2> but 6 € 22 Hene, <2) + 2 (22)
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