Andrew Brooke-Taylor (University of Leeds)

Cardinal characteristics modulo nice ideals on $\omega$

Many of the standard cardinal characteristics of the continuum are defined in terms of a relation holding almost everywhere, where "almost everywhere" means on all but a finite set. A very natural generalisation is to take "almost everywhere" to mean on all but a member of a given ideal. I will talk about what happens when we do this, with the density 0 ideal on $\omega$ as a focal example.

• Speaker's homepage