English

On Ramsey properties, function spaces, and topological games

General Topology 2019-07-12 v1

Abstract

An open question of Gruenhage asks if all strategically selectively separable spaces are Markov selectively separable, a game-theoretic statement known to hold for countable spaces. As a corollary of a result by Berner and Juhaˊ\acute{a}sz, we note that the strong version of this statement, where the second player is restricted to selecting single points in the rather than finite subsets, holds for all T3T_3 spaces without isolated points. Continuing this investigation, we also consider games related to selective sequential separability, and demonstrate results analogous to those for selective separability. In particular, strong selective sequential separability in the presence of the Ramsey property may be reduced to a weaker condition on a countable sequentially dense subset. Additionally, γ\gamma- and ω\omega- covering properties on XX are shown to be equivalent to corresponding sequential properties on Cp(X)C_p(X). A strengthening of the Ramsey property is also introduced, which is still equivalent to α2\alpha_2 and α4\alpha_4 in the context of Cp(X)C_p(X).

Keywords

Cite

@article{arxiv.1907.05153,
  title  = {On Ramsey properties, function spaces, and topological games},
  author = {Steven Clontz and Alexander V. Osipov},
  journal= {arXiv preprint arXiv:1907.05153},
  year   = {2019}
}

Comments

17 pages

R2 v1 2026-06-23T10:18:22.613Z