Abstract:
In the present paper, under the continuum hypothesis, we construct an example of a discretely generated compact set X whose square is not discretely generated. For each compact set X, there is an ordinally valued characteristic idc(X), which is the least number of iterations of the d-closure generating, as a result, the closure of any original subset X. We prove that if χ(X)⩽ωα, then idc(X)⩽α+1.
Citation:
A. V. Ivanov, E. V. Osipov, “Degree of Discrete Generation of Compact Sets”, Mat. Zametki, 87:3 (2010), 396–401; Math. Notes, 87:3 (2010), 367–371