NA Vavilov, AV Stepanov - Vestnik St. Petersburg University: Mathematics, 2010 - Springer
Let R be an associative ring with 1; A, B⊴ R be its ideals; C (n, R, A) be the full congruence
subgroup of level A in GL (n, R); and E (n, R, A) be the relative elementary subgroup of level …