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The Images of the Clique Operator and Its Square are Different |
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| Authors: | Pablo De Caria |
| Affiliation: | CONICET/DEPARTAMENTO DE MATEMáTICA, UNIVERSIDAD NACIONAL DE LA PLATA, ARGENTINAURL: www.mate.unlp.edu.ar/~pdecaria/ |
| Abstract: | Let  be the class of all graphs and K be the clique operator. The validity of the equality  has been an open question for several years. A graph in  but not in  is exhibited here. |
| Keywords: | clique graph clique operator iterated clique graph octahedral graph |
