Let （R, A） be a commutative form ring. We obtain a complete description of all subgroups of quadratic groups Q2n（R, A） which are normalized by elementary subgroups by form ideals, rather than usual ideals. For the...Let （R, A） be a commutative form ring. We obtain a complete description of all subgroups of quadratic groups Q2n（R, A） which are normalized by elementary subgroups by form ideals, rather than usual ideals. For the weak sandwich theorem, we give a direct proof without using localization method.展开更多
基金supported by National Natural Science Foundation of China(Grant No.10871011)
文摘Let （R, A） be a commutative form ring. We obtain a complete description of all subgroups of quadratic groups Q2n（R, A） which are normalized by elementary subgroups by form ideals, rather than usual ideals. For the weak sandwich theorem, we give a direct proof without using localization method.
