Provides partial affirmative result, counterexamples for every countably infinite ordinal and a 3-CLI abelian case, plus upper bound β·(ω·α+1) for extensions of non-archimedean CLI Polish groups.
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On the complexity of extensions of non-archimedean Polish groups admitting a compatible complete left-invariant metric
Provides partial affirmative result, counterexamples for every countably infinite ordinal and a 3-CLI abelian case, plus upper bound β·(ω·α+1) for extensions of non-archimedean CLI Polish groups.