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    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)
    Please see attached for full question.

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    Solution Summary

    Ideals are investigated. The response received a rating of "5" from the student who originally posted the question.