Newelski's Ellis group conjecture for definable flows
Newelski's Ellis group conjecture for definable flows
Let be a first-order structure and let be an -definable group. The space is the universal definable flow of over , and is the smallest type-definable subgroup of of bounded index. Under relatively tame assumptions, generally understood to include , Newelski's Ellis group conjecture. The Ellis group of is isomorphic to
The source identifies this as Newelski's conjecture and separately records positive results in several tame settings, while the broader conjecture has counterexamples. This environment is a restatement of the earlier prose formulation and is therefore merged into the same database row.
Sources & referencesView supporting material
Primary source
Grzegorz Jagiella, “The Ellis group conjecture and variants of definable amenability”, arXiv:1710.11081 (2017).
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