We prove the following results.
- If X is a α-favourable space, Y is a regular space, in which
every separable closed set is compact, and f:X×Y→R is a
separately continuous everywhere jointly discontinuous function, then there
exists a subspace Y0⊆Y which is homeomorphic to βN.
- There exist a α-favourable space X, a dense in $\beta\mathbb
N\setminus\mathbb NcountablycompactspaceY$ and a separately continuous
everywhere jointly discontinuous function f:X×Y→R.
Besides, it was obtained some conditions equivalent to the fact that the
space Cp(βN∖N,{0,1}) of all continuous
functions x:βN∖N→{0,1} with the topology of
point-wise convergence is a Baire space.