Countable sections for locally compact group actions

@inproceedings{KECHRISt2013CountableSF,
  title={Countable sections for locally compact group actions},
  author={ALEXANDER S. KECHRISt},
  year={2013}
}
  • ALEXANDER S. KECHRISt
  • Published 2013
It has been shown by J. Feldman, P. Hahn and C. C. Moore that every non-singular action of a second countable locally compact group has a countable (in fact so-called lacunary) complete measurable section. This is extended here to the purely Borel theoretic category, consisting of a Borel action of such a group on an analytic Borel space (without any measure). Characterizations of when an arbitrary Borel equivalence relation admits a countable complete Borel section are also established.