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The free roots of the complete graph
Authors:Enrique Casanovas   Frank O. Wagner
Affiliation:Departament de Lògica, Història i Filosofia de la Ciència, Universitat de Barcelona, Baldiri Reixac s/n, 08028 Barcelona, Spain ; Institut Girard Desargues, Université Claude Bernard (Lyon 1), 21, avenue Claude Bernard, 69622 Villeurbanne, France
Abstract:There is a model-completion $T_n$ of the theory of a (reflexive) $n$-coloured graph $langle X,R_1,ldots,R_nrangle$ such that $R_n$ is total, and $R_icirc R_jsubseteq R_{i+j}$ for all $i,j$. For $n>2$, the theory $T_n$ is not simple, and does not have the strict order property. The theories $T_n$ combine to yield a non-simple theory $T_infty$ without the strict order property, which does not eliminate hyperimaginaries.

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