Cofinitely δ_ss-supplemented modules

In the first part of this study cofinitely δ_ss-supplemented modules are introduced as a generalization of δ_ss-supplemented modules. It is shown that the case of being cofinitely δ_ss-supplemented for a module M is preserved under factor modules, direct summands and M-generated modules. An arbitrary sum of cofinitely δ_ss-supplemented modules is also cofinitely δ_ss-supplemented. A module is cofinitely δ_ss-supplemented if and only if each maximal submodule has a δ_ss-supplement. In the second part of the study amply cofinitely δ_ss-supplemented modules are defined and basic algebraic properties are investigated similar to first part. At the end some examples are given showing that mentioned module inclusions are proper.