December 2015

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

Tuesday, December 8, 2015 17:15

Room: D1-215

Speaker:
David Chodounsky

Title: Y-cc and Y-proper forcing notions

Abstract. In our recent joint work 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.