Submission date: 25 July 2023

Abstract:

We study possibilities for semantic and syntactic rigidity, i.e., the rigidity with respect to automorphism group and with respect to definable closure. Variations of rigidity and their degrees are studied in general case, for special languages and for some natural operations with structures.

Mathematics Subject Classification: 03C50, 03C30

Keywords and phrases:

Full text arXiv 2307.13228: pdf, ps.