Weakly generic and almost periodic types in definably amenable groups

Let GG be a definable, definably amenable group defined over either an oo-minimal structure or a pp-adically closed field. Say that GG is stationary when it has the stationarity property considered in the paper, and let weakly generic and almost periodic types be understood in the relevant type spaces. The weakly generic–almost periodic conjecture. If GG is not dfg\mathrm{dfg}, then the set of weakly generic types coincides with the set of almost periodic types if and only if GG is stationary. The preceding counterexamples show that non-stationarity can cause these sets to differ, but the converse in this general setting remains open.

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Primary source

Ningyuan Yao and Zhentao Zhang, “On minimal flows and definable amenability in some distal NIP theories”, arXiv:2209.08495 (2023).

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