---------- Forwarded message --------- On 15-17 April, 2024 the University of Gothenburg will host the 2024 edition of its annual Lindström Lectures. The Lindström Lectures is a distinguished lecture series initiated in 2013 celebrating the memory of Per (Pelle) Lindström, former (and first) professor in logic at the University of Gothenburg. For information about the Lindström lecture series see: https://www.gu.se/en/flov/the-lindstrom-lectures
We are proud to announce that the 2024 Lindström Lectures will be delivered by Phokion G. Kolaitis, Distinguished Research Professor at UC Santa Cruz and a Principal Research Staff Member at the IBM Almaden Research Center, US. Professor Kolaitis will deliver a public lecture on Monday, 15 April 2024, 1800–2000 and a research lecture on Wednesday, 17 April at 10–12. Both lectures will be held at the University of Gothenburg. The public lecture will also be broadcast over Zoom. Title and abstracts are appended to this message. A Zoom link for the public lecture will be distributed on the Nordic Online Logic Seminar mailing list (https://listserv.gu.se/sympa/subscribe/nordiclogic). Alternatively, contact Graham Leigh <graham.le...@gu.se<mailto:graham.le...@gu.se>> directly. Best wishes, Graham Public Lindström Lecture Monday, 15 April 2024 at 18:00 (UTC+2) at the Faculty of Humanities, University of Gothenburg and over Zoom Phokion G. Kolaitis (University of California Santa Cruz and IBM Research) Characterizing Rule-based Languages Abstract: There is a mature body of work in logic aiming to characterize logical formalisms in terms of their structural or model-theoretic properties. The origins of this work can be traced to Alfred Tarski’s program to characterize metamathematical notions in “purely mathematical terms” and to Per Lindström’s abstract characterizations of first-order logic. For the past forty years, rule-based logical languages have been widely used in databases and in related areas of computer science to express integrity constraints and to specify transformations in data management tasks, such as data exchange and ontology-based data access. The aim of this talk is to present an overview of more recent results that characterize various classes of rule-based logical languages in terms of their structural or model-theoretic properties. Research Lindström Lecture Wednesday, 17 April 2024 at 10:00 (UTC+2) at the Faculty of Humanities, University of Gothenburg Phokion G. Kolaitis (University of California Santa Cruz and IBM Research) Homomorphism Counts: Expressive Power and Query Algorithms Abstract: A classical result by Lovász asserts that two graphs G and H are isomorphic if and only if they have the same left profile, that is, for every graph F, the number of homomorphisms from F to G coincides with the number of homomorphisms from F to H. A similar result is also known to hold for right profiles, that is, two graphs G and H are isomorphic if and only if for every graph F, the number of homomorphisms from G to F coincides with the number of homomorphisms from H to F. During the past several years, there has been a study of equivalence relations that are relaxations of isomorphism obtained by restricting the left profile or the right profile to suitably restricted classes of graphs, instead of the class of all graphs. Furthermore, a notion of a query algorithm based on homomorphism counts was recently introduced and investigated. The aim of this talk is to present an overview of some of the main results in this area with emphasis on the differences between left homomorphism counts and right homomorphism counts. -- LOGICA-L Lista acadêmica brasileira dos profissionais e estudantes da área de Lógica <logica-l@dimap.ufrn.br> --- Você está recebendo esta mensagem porque se inscreveu no grupo "LOGICA-L" dos Grupos do Google. Para cancelar inscrição nesse grupo e parar de receber e-mails dele, envie um e-mail para logica-l+unsubscr...@dimap.ufrn.br. Para acessar esta discussão na web, acesse https://groups.google.com/a/dimap.ufrn.br/d/msgid/logica-l/CAO6j_Lgtfs3V%3DtS_owLOFob84k57oLs67QPBxQ2B9ukQ0e1H1w%40mail.gmail.com.
