Question: Let R be a commutative ring and My(R) the ring of 2-by-2 matrices with entries in R (with the usual matrix addition and multiplication). Prove

Let R be a commutative ring and My(R) the ring of 2-by-2 matrices with entries in R (with the usual matrix addition and multiplication). Prove that if 1 is an ideal in R then M>(/) is an ideal in M>(R)

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