On properties of compacta that do not reflect in small continuous images

Abstract

Assuming that there is a stationary set in ${\omega }_2$ of ordinals of countable cofinality that does not reflect, we prove that there exists a compact space which is not Corson compact and whose all continuous images of weight at most ${\omega }_1$ are Eberlein compacta. This yields an example of a Banach space of density ${\omega }_2$ which is not weakly compactly generated but all its subspaces of density ${\omega }_1$ are weakly compactly generated. We also prove that under Martin's axiom countable functional tightness does not reflect in small continuous images of compacta.

10 pages, version of Aug 8, 2016