# Recent and upcoming talks by Tomasz Natkaniec

## Tomasz Natkaniec: Perfectly everywhere surjective but not Jones functions

Tuesday, November 14, 2017, 17:15 Wrocław University of Technology, 215 D-1 Speaker: Tomasz Natkaniec (University of Gdansk) Title: Perfectly everywhere surjective but not Jones functions Abstract: Given a function $f:\mathbb{R}\to\mathbb{R}$ we say that $f$ is perfectly surjective ($f\in \mathrm{PES}$) if $f[P]=\mathbb{R}$ for every perfect set $P$; $f$ is a Jones function ($f\in\mathrm{J}$) if $C\cap f\neq\emptyset$ for every closed $C\subset\mathbb{R}^2$ with $\mathrm{dom}(C)$ of size $\mathfrak{c}$. continue reading…