On dense subspaces of C_p(X)

Abstract

For a Tychonoff space X, we denote by C_p(X) the space of all real-valued continuous functions on X with the topology of pointwise convergence. We show the following:(1) if ω₁ is a caliber for every dense subspace of C_p(X), then C_p X) is (ω₁, ω₁)-narrow; (2) if every dense subspace of C_p(X) is compact-dense in C_p(X), then every non-trivial countable $\varpi$-cover of open sets of X contains a γ-cover. The first result gives the positive answer to Problem 4.4 in [6], and the second one is a partial answer to Problem 4.3 in [6].