G\(L_ 2\) over full rings
Let R be a commutative ring. The authors prove the ``sandwich theorem'' for all subgroups of \(GL_ 2(R)\) normalized by \(SL_ 2(R)\) for some special classes of rings R.
subgroups of \(GL_ 2(R)\) normalized by \(SL_ 2(R)\)
scientific article; zbMATH DE number 4040178