Submission date: 1 January 2016.

Abstract:

We investigate combinations of structures by families of structures relative to families of unary predicates and equivalence relations. Conditions preserving ω-categoricity and Ehrenfeuchtness under these combinations are characterized. The notions of e-spectra are introduced and possibilities for e-spectra are described.

Mathematics Subject Classification: 03C30, 03C15, 03C50

Keywords and phrases:

Full text arXiv 1601.00041: pdf, ps.