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Speech acts as announcements Guiraud, Nadine Herzig, Andreas Lorini, Emiliano Logic of belief logic of goals speech act theory dynamic epistemic logic public announcements Our aim is to use the logic of public announcements and more generally dynamic epistemic logics as a logic of speech acts. To that end we start from a simple multimodal logic of beliefs and goals (without common belief), and add public announcements. We suppose that announcements do not modify goals. We then consider several variants of speech acts of assertive and directive force and provide a modelling in terms of speech acts. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Nadine Guiraud and Andreas Herzig and Emiliano Lorini 2009 Is Part Of Dagstuhl Seminar Proceedings, Volume 9351, Information processing, rational belief change and social interaction (2009) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.09351.8 urn:nbn:de:0030-drops-22935 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09351.8 eng https://creativecommons.org/licenses/by/4.0/legalcode