Abdón Sánchez-Arroyo

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The total chromatic number of an arbitrary graph is the smallest number of colours needed to colour the edges and vertices of the graph so that no two adjacent or incident elements of the graph receive the same colour. In this paper we prove that the problem of determining the total chromatic number of a k-regular bipartite graph is NP-hard, for each fixed(More)
Enchondroma is the most frequent benign tumor in hand bones. It occasionally occurs in the distal phalanx of the fingers; it is usually an asymptomatic lesion, but pain may occur when it is associated with a fracture. The most recommended treatment is lesion curettage and application of a bone graft, besides fixation as needed. Five cases with location in(More)
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