Abstract
A graph is said to be k-extendable if any independent set of k edges extends to a perfect matching. We shall show that every 5-connected graph of even order embedded on the projective plane and every 6-connected one embedded on the torus and the Klein bottle is 2-extendable and characterize the forbidden structures for 5-connected toroidal graphs to be 2-extendable.
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Mizukai, I., Negami, S. & Suzuki, Y. The 2-Extendability of Graphs on the Projective Plane, the Torus and the Klein Bottle. Graphs and Combinatorics 26, 549–557 (2010). https://doi.org/10.1007/s00373-010-0927-8
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DOI: https://doi.org/10.1007/s00373-010-0927-8