Seminar Calendar
for Model Theory and Descriptive Set Theory Seminar events the next 2 months of Friday, April 28, 2017.

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Friday, April 28, 2017

Model Theory and Descriptive Set Theory Seminar
4:00 pm   in 345 Altgeld Hall,  Friday, April 28, 2017
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Submitted by ssolecki.
Ward Henson (UIUC, UC Berkeley)
On definability and interpretability in model theory
Abstract: This will be an expository talk. Topics covered/mentioned will include: extension by definition and expansion/extension by interpretation (the eq-construction), Beth's Theorem (characterizing definability), and Makkai's Theorem (characterizing the eq-expansion). The setting will be model theory of classical (discrete) structures and then of metric (real-valued) structures. In the metric setting, definability of sets/relations has some subtleties that do not arise in discrete structures.