16D80 13C99 5 16D10 4 16U80 3 $J$-symmetric ring 2 16D99 2 Compressible 2 Jacobson radical 2 Rickart modules 2 abelian modules 2 critically compressible 2 left duo ring 2 polyform 2 principally projective modules 2 reduced modules 2 rigid modules 2 semicommutative modules 2 symmetric modules 2 symmetric ring 2 uniform 2 16D40 1 2-primal rings 1 Rickart module 1 \(F\)-local and \(F\)-hollow modules 1 \(F\)-supplement and \(F\)-small submodules 1 \(F\)-supplemented 1 \(\mathrm{Rad}(\cdot)\)-inverse split module 1 \(\mathrm{Soc}(\cdot)\)-inverse split module 1 central Armendariz rings 1 central reduced rings 1