Abstract
Let G be a 2-edge-connected simple graph with girth g, independence number α(G), and if one of the following two conditions holds
-
(1)
α(G) ≤ 2;
-
(2)
α(G) ≥ 3, and for any three nonadjacent vertices v i (i = 1,2,3), it has
$$\sum\limits_{i=1}^{3}d_{G}(v_i) \geq \nu - 3g +7$$,
then G is upper embeddable and the lower bound v − 3g + 7 is best possible. Similarly the result for 3-edge-connected simple graph with girth g and independence number α(G) is also obtained.
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Huang Yuanqiu: Partially supported by National Science Foundation of China (No. 10771062) and Program for New Century Excellent Talents in University (No. NCET-07-0276).
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Zhangdong, O., Jing, W. & Yuanqiu, H. Upper Embeddability, Girth and the Degree-Sum of Nonadjacent Vertices. Graphs and Combinatorics 25, 253–264 (2009). https://doi.org/10.1007/s00373-008-0837-1
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DOI: https://doi.org/10.1007/s00373-008-0837-1