On stability of the Hamiltonian index under contractions and closures
| Jazyk: | angličtina |
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| Rok vydání: | 2002 |
| Předmět: | |
| Popis: | The hamiltonian index of a graph $G$ is the smallest integer $k$ such that the $k$-th iterated line graph of $G$ is hamiltonian. We first show that, with one exceptional case, adding an edge to a graph cannot increase its hamiltonian index. We use this result to prove that neither the contraction of an $A_G(F)$-contractible subgraph $F$ of a graph $G$ nor the closure operation performed on $G$ (if $G$ is claw-free) affects the value of the hamiltonian index of a graph $G$. |
| Databáze: | OpenAIRE |
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