On forcibility of $\Sigma_2$ sentences over $L(V_\delta)$

David Aspero (U of East Anglia, Norwich)

Jul 06. 2022, 11:00 — 11:30

In this talk I will address the prospect of obtaining arbitrary forcible (over $V$) $\Sigma_2$ sentences by forcing over a fixed model of the form $L(V_\delta)$. This will motivate a ``local'' version of $\Omega$-logic for which one can prove a completeness theorem in the spirit of Woodin's $\Omega$-conjecture. Time permitting, I will present partial results (joint with R.\ Schindler) on the consistency of $MM^{++, *}$, a natural enhancement of $MM^{++}$ involving the strong notion of consistency at play in the definition of $\Omega$-logic.    

 

Further Information
Venue:
ESI Boltzmann Lecture Hall
Recordings:
Recording
Associated Event:
Set-Theory (Workshop)
Organizer(s):
Jörg Brendle (Kobe U)
Vera Fischer (U of Vienna)
Sy David Friedman (U of Vienna)