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Co-spectra of joint spectra of structures

Authors: Alexandra Soskova, Ivan Soskov

We introduce and study the notion of joint spectrum of finitely many abstract structures.
A characterization of the lower bounds of the elements of the joint spectrum is
obtained.

Annotation in PDF format: (PDF document 19Kb)
Keywords: enumeration reducibility, enumeration jump, enumeration degrees, forcing
2000 MSC: 03D30