Seminars & Colloquia Calendar
"Strong Chang's Conjecture and semiproperness of nonreasonable posets "
Sean Cox , Virginia Commonwealth University
Location: HILL 705
Date & time: Monday, 01 May 2017 at 5:00PM 



Abstract: A wellknown theorem of Shelah states that semiproperness of Namba forcing is equivalent to a version of Strong Chang's Conjecture. We consider a certain poset \(mathbb{Q}\) that: preserves stationary subsets of \(omega_1\) and kills the stationarity of the ground model's \([omega_2]^omega\) (like Namba forcing); yet preserves that \(omega_2\) has uncountable cofinality (unlike Namba forcing). We prove that semiproperness of \(mathbb{Q}\) lies between two versions of Strong Chang's Conjecture (answering a question of FriedmanKrueger). 
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