Publications > Preprint server > Preprint Number 898
Preprint Number 898
898. Vera Koponen
Binary primitive homogeneous one-based structures
Submission date: 27 July 2015.
Suppose that M is countable, binary, primitive, homogeneous, simple and 1-based. We prove that the SU-rank of the complete theory of M is 1. It follows that M is a random structure. The conclusion that M is a random structure does not hold if the binarity condition is removed, as witnessed by the generic tetrahedron-free 3-hypergraph. However, to show that the generic tetrahedron-free 3-hypergraph is 1-based requires some work (it is known that it has the other properties) since this notion is defined in terms of imaginary elements. This is partly why we also characterize equivalence relations which are definable without parameters in the context of omega-categorical structures with degenerate algebraic closure. Another reason is that such characterizations may be useful in future research about simple (nonbinary) homogeneous structures.
Mathematics Subject Classification:
Keywords and phrases:
|Last updated: August 12 2015 09:42||Please send your corrections to:|