2020 seminar talk: Fraïssé theory, and forcing absoluteness of rigidity for linear orders

Talk held by Ziemowit Kostana (University of Warsaw, Poland) at the KGRC seminar on 2020-10-15.


During the talk I would like to introduce the theory of Cohen-like first-order structures. These are countable or uncountable structures which are “generic” much in the same sense as the Cohen reals. They can be added to the universe of set theory using finite or, say, countable conditions and exhibit different properties. I will focus on the construction of a rigid linear order, whose rigidity is absolute for ccc extensions.

Time and Place

Talk at 3:00pm via Zoom

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Kurt Gödel Research Center for Mathematical Logic. Währinger Straße 25, 1090 Wien, Austria. Phone +43-1-4277-50501. Last updated: 2010-12-16, 04:37.