# David Chodounsky: Y-cc and Y-proper forcing notions

Tuesday, December 8, 2015, 17:15
Wrocław University of Technology, 215 D-1

Speaker: David Chodounsky (Czech Academy of Sciences)

Title: Y-cc and Y-proper forcing notions

Abstract:

In our recent joint work with J. Zapletal, we explored a new type of properties of forcing notions, of which the Y-cc and Y-proper are the most prolific examples. These two notions can be seen as a generalization of the notion of $\sigma$-centered. While keeping similar consequences a larger and better behaved class of posets is cover by these notions.
I will give an introduction to this topic with the focus on understating the basic techniques and ideas.