A lower density operator for the Borel algebra

Autor:	Balcerzak, Marek, Głab, Szymon
Rok vydání:	2019
Předmět:	Mathematics - General Topology Primary: 28A51 Secondary: 03E50 03E35
Druh dokumentu:	Working Paper
Popis:	We prove that the existence of a Borel lower density operator (a Borel lifting) with respect to the $\sigma$-ideal of countable sets, for an uncountable Polish space, is equivalent to the Continuum Hypothesis.
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1903.02397 Zobrazit plný text záznamu View this record from Arxiv