Czechoslovak Mathematical Journal, Vol. 57, No. 2, pp. 705-724, 2007

# On potentially $H$-graphic sequences

## Meng-Xiao Yin, Jian-Hua Yin

Meng-Xiao Yin, College of Computer and Electronics Information, Guangxi University, Nanning, Guangxi 530004, China; Jian-Hua Yin, Department of Applied Mathematics, College of Information Science and Technology, Hainan University, Haikou, Hainan 570228, China, e-mail: yinjh@ustc.edu

Abstract: For given a graph $H$, a graphic sequence $\pi=(d_1,d_2,\ldots,d_n)$ is said to be potentially $H$-graphic if there is a realization of $\pi$ containing $H$ as a subgraph. In this paper, we characterize the potentially $(K_5-e)$-positive graphic sequences and give two simple necessary and sufficient conditions for a positive graphic sequence $\pi$ to be potentially $K_5$-graphic, where $K_r$ is a complete graph on $r$ vertices and $K_r-e$ is a graph obtained from $K_r$ by deleting one edge. Moreover, we also give a simple necessary and sufficient condition for a positive graphic sequence $\pi$ to be potentially $K_6$-graphic.

Keywords: graph, degree sequence, potentially $H$-graphic sequence

Classification (MSC 2000): 05C07

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