Question: a 3b 9. Let R = {a + bv3 a, b E Z} and R' the 2 x 2 matrices b a where a, b

a 3b 9. Let R = {a + bv3 a, b E Z} and R' the 2 x 2 matrices b a where a, b E Z. a. Show that R is a subring of R. b. Show that R' is a subring of M2 (Z). c. Show that p: R - R' by p(a + bv3 = is a ring Lb a isomorphism

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