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A subset of vertices in a graph is an open packing set if no pair of vertices of has a common neighbor in . An open packing set which is not a proper subset of any open packing set is called a maximal open packing set. The maximum cardinality of an open packing set is called the open packing number and is denoted by . A subset in a graph with no isolated vertex is called a total dominating set if any vertex of is adjacent to some vertex of . The total domination number of , denoted...
In this note, for a ring endomorphism and an -derivation of a ring , the notion of weakened -skew Armendariz rings is introduced as a generalization of -rigid rings and weak Armendariz rings. It is proved that is a weakened -skew Armendariz ring if and only if is weakened -skew Armendariz if and only if is weakened -skew Armendariz ring for any positive integer .
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