Mekler’s construction and generalized stability
@article{Chernikov2017MeklersCA, title={Mekler’s construction and generalized stability}, author={Artem Chernikov and Nadja Hempel}, journal={Israel Journal of Mathematics}, year={2017}, volume={230}, pages={745-769} }
Mekler’s construction gives an interpretation of any structure in a finite relational language in a group (nilpotent of class 2 and exponent p > 2, but not finitely generated in general). Even though this construction is not a bi-interpretation, it is known to preserve some model-theoretic tameness properties of the original structure including stability and simplicity. We demonstrate that k-dependence of the theory is preserved, for all k ∈ N, and that NTP2 is preserved. We apply this result…
8 Citations
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References
SHOWING 1-10 OF 22 REFERENCES
Groups and fields with NTP2
- Mathematics
- 2012
NTP2 is a large class of first-order theories defined by Shelah and generalizing simple and NIP theories. Algebraic examples of NTP2 structures are given by ultra-products of p-adics and certain…
Classification theory - and the number of non-isomorphic models, Second Edition
- MathematicsStudies in logic and the foundations of mathematics
- 1990
Stability of nilpotent groups of class 2 and prime exponent
- MathematicsJournal of Symbolic Logic
- 1981
It is suggested that the problem of characterizing the wo-stable groups is intractable.
Strongly dependent theories
- Mathematics
- 2005
We further investigate the class of models of a strongly dependent (first order complete) theory T, continuing [Sh:715], [Sh:783] and related works. Those are properties (= classes) somewhat parallel…
Definable groups for dependent and 2-dependent theories
- Mathematics
- 2007
Let T be a (first order complete) dependent theory, C a kappa-saturated model of T and G a definable subgroup which is abelian. Among subgroups of bounded index which are the union of < kappa type…
On Kim-independence
- MathematicsJournal of the European Mathematical Society
- 2020
We study NSOP$_{1}$ theories. We define Kim-independence, which generalizes non-forking independence in simple theories and corresponds to non-forking at a generic scale. We show that…
AN INDEPENDENCE THEOREM FOR NTP2 THEORIES
- MathematicsThe Journal of Symbolic Logic
- 2014
The dividing order of a theory is defined—a generalization of Poizat’s fundamental order from stable theories—and some equivalent characterizations under the assumption of NTP2 are given.