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Prove that A is a commutative ring in relation with addition

Algebra 2
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Prove that A is a commutative ring in relation with addition

Postby Guest » Sat Nov 02, 2019 12:59 pm

We have A = {a+b√2 | a,b∈Z}. Prove that A is a commutative ring in relation with addition and multiplication of real numbers.
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