# Dilip Raghavan: A bound for the weak covering number of the density 0 ideal

Invitation to the Logic Seminar at the National University of Singapore

Date: Wednesday, 11 March 2015, 17:00 hrs

Room: S17#05-11, Department of Mathematics, NUS

Speaker: Dilip Raghavan

Title: A bound for the weak covering number of the density 0 ideal.

URL: http://www.comp.nus.edu.sg/~fstephan/logicseminar.html

We prove a ZFC bound for cov*(Z_0) where Z_0 is the ideal of sets of
asymptotic density 0. This answers a question about diagonalizing
F_{sigma delta} ideals without adding unbounded reals.
This is joint work with Saharon Shelah.