Seminars & Colloquia Calendar
Compactness of {tex} \omega_1 {/tex}
Nam Trang , University of California  Irvine
Location: Hill 705
Date & time: Monday, 27 March 2017 at 5:00PM 

Nam Trang , University of California  Irvine 
"Compactness of {tex} omega_1 {/tex}" 
Time: 5:00 PM 
Location: Hill 705 
Abstract: We investigate various aspects of compactness of {tex} omega_1 {/tex} under ZF + DC (the Axiom of Dependent Choice). We say that omega_1 is Xsupercompact if there is a normal, fine, countably complete nonprincipal measure on {tex} powerset_{omega_1}(X) {/tex} (in the sense of Solovay). We say omega_1 is Xstrongly compact if there is a fine, countably complete nonprincipal measure on powerset_{omega_1}(X). A longstanding open question in set theory asks whether (under ZFC) "supercompactness" can be equiconsistent with "strong compactness. We ask the same question under ZF+DC. More specifically, we discuss whether the theories "omega_1 is Xsupercompact" and "omega_1 is Xstrongly compact" can be equiconsistent for various X. The global question is still open but we show that the local version of the question is false for various X. We also discuss various results in constructing and analyzing canonical models of AD^+ + omega_1 is Xsupercompact. 
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