GENERIC EXPANSIONS OF GEOMETRIC THEORIES

Author:

JALILI SOMAYE,POURMAHDIAN MASSOUD,TAVANA NAZANIN ROSHANDEL

Abstract

Abstract As a continuation of ideas initiated in [19], we study bi-colored (generic) expansions of geometric theories in the style of the Fraïssé–Hrushovski construction method. Here we examine that the properties $NTP_{2}$ , strongness, $NSOP_{1}$ , and simplicity can be transferred to the expansions. As a consequence, while the corresponding bi-colored expansion of a red non-principal ultraproduct of p-adic fields is $NTP_{2}$ , the expansion of algebraically closed fields with generic automorphism is a simple theory. Furthermore, these theories are strong with $\operatorname {\mathrm {bdn}}(\text {"}x=x\text {"})=(\aleph _0)_{-}$ .

Publisher

Cambridge University Press (CUP)

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