Abstract
For matrix linear equations AX + BY = C and AX + YB = C over quadratic rings $$ \mathbb{Z}\left[\sqrt{k}\right] $$ , we establish necessary and sufficient conditions for the existence of integer solutions, i.e., solutions X and Y over the ring of integers $$ \mathbb{Z} $$ . We also present the criteria of uniqueness of the integer solutions of these equations and the method for their construction.
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