Abstract
Let G be a simple graph of order n and girth g. For any two adjacent vertices u and v of G, if d G (u) + d G (v) ⩾ n − 2g + 5 then G is up-embeddable. In the case of 2-edge-connected (resp. 3-edge-connected) graph, G is up-embeddable if d G (u) + d G (v) ⩾ n − 2g + 3 (resp. d G (u) + d G (v) ⩾ n − 2g −5) for any two adjacent vertices u and v of G. Furthermore, the above three lower bounds are all shown to be tight.
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This work was supported by National Natural Science Foundation of China (Grant No. 10571013)
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Dong, G., Liu, Y. Up-embeddability via girth and the degree-sum of adjacent vertices. Sci. China Ser. A-Math. 52, 597–604 (2009). https://doi.org/10.1007/s11425-008-0126-8
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DOI: https://doi.org/10.1007/s11425-008-0126-8