Question: a (C) Show that c = H: '5'] 0,!) E R} is a subring of M2(R). Moreover, prove that C is a commutative ring with

a (C) Show that c = H: '5'] 0,!) E R}

a (C) Show that c = H: '5'] 0,!) E R} is a subring of M2(R). Moreover, prove that C is a commutative ring with unity even if MAR) is not. Finally, show that C is a eld. .1 . o c ..... an... n

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