Universality on spaces continuously containing topological groups


S D Iliadis, Yu V Sadovnichy




In 1986 V.V. Uspenskij proved that there exists a universal topological group with a countable base and in 1990 put the problem: does there exist a universal topological group of weight an uncountable cardinal τ? This problem is still open. In 2015 we gave the notion of a continuously containing space for a given collection of topological groups and proved that there exists such a space of weight τ for the collection of all topological groups of weight ≤ τ. In the present paper we prove that in the class of all topological spaces of weight ≤ τ, which are continuously containing spaces for a collection of topological groups, there are universal elements