Seminars & Colloquia Calendar

Download as iCal file

Logic Seminar

"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 well-known 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 Friedman-Krueger).

Special Note to All Travelers

Directions: map and driving directions. If you need information on public transportation, you may want to check the New Jersey Transit page.

Unfortunately, cancellations do occur from time to time. Feel free to call our department: 848-445-6969 before embarking on your journey. Thank you.