Series: Penn State Logic Seminar Date: Tuesday, April 16, 2002 Time: 2:30 - 3:45 PM Place: 113 McAllister Building Speaker: James Cummings, Mathematics, Carnegie Mellon University Title: Some Applications of PCF Abstract: PCF theory was invented by Shelah to answer some questions in cardinal arithmetic. It turns out to be applicable to a wide class of problems in combinatorial set theory. We will sketch some applications.