Abstract Algebra 12.3: Subrings

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We discuss what it means to be a subring, and look at two tests for determining whether a subset is a subring.
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Thank you so much for this great playlist!
It really does help!

MM-eixv
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What are the cases when you use test 1 and test 2?

traciiilatouche
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hello, what I dont understand is why do we need substraction to show it is a subset?

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