Mathematical logic seminar - Feb 20 2018

Time: 3:30pm - 4:30 pm

Room: Wean Hall 8220

Speaker:     James Cummings    
Department of Mathematical Sciences

Title: Some strong chain conditions


One of the basic facts in forcing is that a finite support iteration of ccc forcing is ccc. This underlies (for example) the consistency proof for Martin's Axiom. In general an iteration of κ-closed κ+-cc forcing with <κ-support fails to be κ+-cc, and we need strngthened forms of the chain condition. I will discuss some of these strong chain conditions and the corresponding iteration theorems.