, We see that all the properties are satisfied and thus that m ? ? ?s (O(s, ?)), the associated 3-partition is

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N. J. , UFR Sciences exactes et naturelles Laboratoire de Mathématiques FRE 2011 Moulin de la Housse BP 1039 51100 REIMS., C. L.: Institut Denis Poisson UMR CNRS 7013 Faculté des Sciences et Techniques