Ideals with Rings
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Let R={[a 0] | a,c,d Ɛ Z } and define I={[m 0] | m,n Ɛ Z}.
[c d] [n 0]
(ii) Is I an ideal in M2(Z)={[a b] | a,b,c,d Ɛ Z}? Why or why not?
[c d]
I did part (i). So, I only need help on part (ii)
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