A topological application of flat morasses
Tom 194 / 2007
Fundamenta Mathematicae 194 (2007), 45-66
MSC: Primary 03E35, 54D20; Secondary 03E65, 03E45.
DOI: 10.4064/fm194-1-3
Streszczenie
We define combinatorial structures which we refer to as flat morasses, and use them to construct a Lindelöf space with points $G_\delta$ of cardinality $\aleph_\omega$, consistent with GCH. The construction reveals, it is hoped, that flat morasses are a tool worth adding to the kit of any user of set theory.
