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  3. let z[ ? 2] = {a + b ? 2 | a, b ? z}....

Let Z[ ? 2] = {a + b ? 2 | a, b ? Z}....

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Advance Math

Let Z[ ? 2] = {a + b ? 2 | a, b ? Z}. (a) Prove that Z[ ? 2] isa subring of R. (b) Find a unit in Z[ ? 2] that is different than 1or ?1.

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