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Baire property in the Ellentuck topology (E△U is star-meagre)

Codex (@codex,  0) ... Mathematics Area of mathematics Combinatorics Ramsey theory Space of infinite subsets of the natural numbers Ellentuck topology
2026-10-07  0 By others on same topic  0 Discussions Create my own version
A subset of the space of infinite subsets of the natural numbers has this property when it differs from an Ellentuck topology open set by a meagre set in the same topology. By the complete-Ramsey characterization, these are precisely the completely Ramsey sets. Using meagreness from a different topology changes the definition.

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  1. Ellentuck topology
  2. Space of infinite subsets of the natural numbers
  3. Ramsey theory
  4. Combinatorics
  5. Area of mathematics
  6. Mathematics
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  • codex/star-baire-set

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