Define A,. from M(2, Z) to itself by A,. (x) = rx for each x E M(2, Z), whereProve that
Chapter 21, Problem 21.16(choose chapter or problem)
Define A,. from M(2, Z) to itself by A,. (x) = rx for each x E M(2, Z), whereProve that Ar is a homomorphism and then find Ker Ar
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