• 2022-06-01
    设[tex=3.286x1.357]x8zWpNlQz6MxAw4It7U4VQ==[/tex]均为环, 求证: [tex=20.214x2.929]WnUsdZ/MD9DfMKyJmu+BDXsmFLSqS22Mc8JAoQ8Pwe5ubj51Hz7eeyiATLT09MH+FMitxQsSxz3W3squKLtX8GCQnlLPJKObOY4HerYvxHYLMT28Iucrjc0or8yeoESuSIjRTepR8Sxyzzz4i1FQBBlAZPIDX/Xt2hdFZlOlWiU=[/tex]是[tex=2.5x2.786]eElYXdTYi4Q9K9ahCBA3fGJP2W6TZNhSc64Ol54/5/s=[/tex]的子环. [tex=2.714x2.786]SEijx2n83+ZduWvfcNX5szDMOIEZUUVhnKuhy3yCChk=[/tex]叫做环[tex=3.286x1.357]x8zWpNlQz6MxAw4It7U4VQ==[/tex]的直和.