Research Information System
UKRAINIAN MATHEMATICAL JOURNAL, vol.65, no.7, pp.1071-1078, 2013 (SCI-Expanded)
We investigate some properties of supplement submodules. Some relations between lying-above and weak supplement submodules are also studied. Let V be a supplement of a submodule U in M. Then it is possible to define a bijective map between the maximal submodules of V and the maximal submodules of M that contain U. Let M be an R-module, U a parts per thousand currency signaEuro parts per thousand M, let V be a weak supplement of U, and let K a parts per thousand currency signaEuro parts per thousand V. In this case, K is a weak supplement of U if and only if V lies above K in M. We prove that an R-module M is amply supplemented if and only if every submodule of M lies above a supplement in M. We also prove that M is semisimple if and only if every submodule of M is a supplement in M.