Barteld P. Kooi

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In this paper, we present several extensions of epistemic logic with update operators modelling public information change. Next to the well-known public announcement operators, we also study public substitution operators. We prove many of the results regarding expressivity and completeness using so-called reduction axioms. We develop a general method for(More)
Conditional probabilities Pi(φ | A) describe how agent i’s probability distributions for propositions φ change as new information A comes in. The standard probabilistic calculus describing such changes revolves around Bayes’ Law in case the new information A is factual, concerning some actual situation under investigation. But there are also proposed(More)
In this paper I combine the dynamic epistemic logic of Gerbrandy (1999) with the probabilistic logic of Fagin and Halpern (1994). The result is a new probabilistic dynamic epistemic logic, a logic for reasoning about probability, information, and information change that takes higher order information into account. Probabilistic epistemic models are defined,(More)
Over the years many easily computable strategies for the game of Mastermind have been proposed. In this paper we present a new strategy (at least to our knowledge) that performs better than the wellknown strategies: guess the code that has the highest number of possible answers. It is motivated and compared to four well-known strategies. Some empirical(More)
Two groups of agents, G1 and G2, face a moral conflict if G1 has a moral obligation and G2 has a moral obligation, such that these obligations cannot both be fulfilled. We study moral conflicts using a multi-agent deontic logic devised to represent reasoning about sentences like ‘In the interest of group F of agents, group G of agents ought to see to it(More)
rijksuniversiteit groningen knowledge, chance, and change proefschrift ter verkrijging van het doctoraat in de Wiskunde en Natuurwetenschappen aan de Rijksuniversiteit Groningen op gezag van de Rector Magnificus, dr. F. Zwarts, in het openbaar te verdedigen op vrijdag  september  om . uur door Barteld Pieter Kooi geboren op  augustus  te(More)
In an information state where various agents have both factual knowledge and knowledge about each other, announcements can be made that change the state of information. Such informative announcements can have the curious property that they become false because they are announced. The most typical example of that is ‘fact p is true and you don’t know that’,(More)