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Asked Feb 9, 2020
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Can someone please help me understand the following problem. I need to know how to start the problem. i need to know the theorems ,identities,  used please thank you.

 

12. If A and B are ideals of a ring, show that the product of A and B, AB
+ a,b, la, E A, b, E B, na positive integer},
= {a,b, + a,b, + · · ·
is an ideal.
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12. If A and B are ideals of a ring, show that the product of A and B, AB + a,b, la, E A, b, E B, na positive integer}, = {a,b, + a,b, + · · · is an ideal.

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Step 1 We need to show two things:

Advanced Math homework question answer, step 1, image 1

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