Talk held by Raphaël Carroy (KGRC) at the KGRC seminar on 2018-11-22.
We say a function $f$ embeds (topologically) in a function $g$
when there are two topological embeddings $\sigma$ and $\tau$
satisfying $\tau \circ f = g \circ \sigma$. I will prove the
following dichotomy: the quasi-order of topological embeddability
between continuous functions on compact zero-dimensional Polish spaces
is either an analytic complete quasi-order, or a well-quasi-order.
This is a joint work with Yann Pequignot and Zoltán Vidnyánszky.