After a brief discussion of administrative matters that will be led by Richard Farkas (20 min) Kornai will describe his ongoing work on treating negation in natural language not by the standard Boolean operator but by a two-place predicate LACK. Draft paper at http://nessie.ilab.sztaki.hu/~kornai/2020/Semantics/Polarity/kornai_2021.pdf Video (in Hungarian) Slides (in English) (in English)