Valda Seminar: Meghyn Bienvenu

Meghyn Bienvenu, CNRS, University of Bordeaux 18 December 2020, 10:30-11:30 Online seminar: https://bbb.di.ens.fr/b/cam-pz6-kdj Preferred repairs over inconsistent knowledge bases and connections to argumentation A fundamental notion when reasoning over inconsistent knowledge bases is that of a repair, defined as a maximal subset of the data that is consistent w.r.t. the…

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Valda Seminar : Val Tannen

Val Tannen, University of Pennsylvania 21 February 2020, 10:00-11:00 ENS, S16 Provenance Analysis for First-order Model Checking Is a given finite structure a model of a given first-order sentence? The provenance analysis of this question determines how its answer depends on the atomic facts that determine the structure. Provenance questions…

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Valda Seminar: Nofar Carmeli

Nofar Carmeli, Technion, Israel Institute of Technology 28 February 2020, 10:30-11:30 ENS, S16 The Complexity of Answering Unions of Conjunctive Queries We discuss the complexity of enumerating (listing) the answers to a query over a relational database. In particular, we consider three variants: arbitrary order, uniformly random order, and random…

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Valda Seminar: Evgenia Ternovska

Evgenia (Eugenia) Ternovska Associate Professor | School of Computing Science Simon Fraser University 8888 University Dr., Burnaby, B.C. V5A 1S6 13 February 2020, 10:30-11:30 ENS, S16 Logic of Information Flows: Expressing Reachability and Cardinality Properties A challenge in descriptive complexity is to identify logics with low complexity that simultaneously express…

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