Question: Show that : C M 2 (R) given by for a, b R gives an isomorphism of C with the subring [C]

Show that ∅ : C → M2(R) given by

p(a + bi) = D -b a

for a, b ∈ R gives an isomorphism of C with the subring ∅[C] of M2(R).

p(a + bi) = D -b a

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