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Seminar on Reckoning

Sacks forcing and the ♣ principle

David Chodounsky
IM CAS

 

Seminar on Reckoning
Wednesday, 9. September 2020 - 11:00 to 15:00

Institute of Mathematics CAS, Zitna 25, seminar room, 3rd floor, front building

I will present the following result of  Juris Steprans:
Assuming the ◊ principle, there is a ♣-sequence which is no longer a ♣-sequence after adding a single Sacks real.