On potentially -graphic sequences
For given a graph , a graphic sequence is said to be potentially -graphic if there is a realization of containing as a subgraph. In this paper, we characterize the potentially -positive graphic sequences and give two simple necessary and sufficient conditions for a positive graphic sequence to be potentially -graphic, where is a complete graph on vertices and is a graph obtained from by deleting one edge. Moreover, we also give a simple necessary and sufficient condition for...