In this paper some basic mathematical properties for the third and hyper Zagreb coindices of graph operations containing the Cartesian product and composition will be explained.
Abstract. Let M be a right R-module. M is called D 11 −module if every submodule of M has a supplement which is a direct summand of M and M is called a D + 11 − module if every direct summand of M is a D 11 − module. In this paper we study some properties of D 11 modules.
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