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Variations on a sufficient condition for Hamiltonian graphs

Ahmed AinoucheSerge Lapiquonne — 2007

Discussiones Mathematicae Graph Theory

Given a 2-connected graph G on n vertices, let G* be its partially square graph, obtained by adding edges uv whenever the vertices u,v have a common neighbor x satisfying the condition N G ( x ) N G [ u ] N G [ v ] , where N G [ x ] = N G ( x ) x . In particular, this condition is satisfied if x does not center a claw (an induced K 1 , 3 ). Clearly G ⊆ G* ⊆ G², where G² is the square of G. For any independent triple X = x,y,z we define σ̅(X) = d(x) + d(y) + d(z) - |N(x) ∩ N(y) ∩ N(z)|. Flandrin et al. proved that a 2-connected graph G is hamiltonian if...

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