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Subrings in imaginary quadratic fields which are not universal for GE<sub>2</sub>
Subrings in imaginary quadratic fields whichare not universal for GE 2 by Sheng Chen and Hong You (Harbin) Introduction.Let R be a commutative ring with identity 1, R * the group of units in R. Denote by SL n (R) and E n (R) the special linear groups and the …