Logic Seminar

Speaker: Natalia Moangă (University of Bucharest). Abstract: Hybrid logics are obtained by enriching modal logics with nominals and state variables, that directly refer the individual points in a Kripke model. In the present work we develop a hybrid version on top of our many-sorted polyadic logic, previously defined. Our system has nominals and state variables …

Speaker: Alexandru Dragomir (University of Bucharest) Abstract: One of the first and most discussed logical approaches to the problem of verifying security protocols is the one proposed in BAN logic (Burrows, Abadi & Needham 1989), a many-sorted modal logic used for its intuitive and compelling set of inference rules devised for reasoning about an agent’s …

Speaker: Mihai Prunescu (University of Bucharest) Abstract: Regular logic systems which are strictly stronger than the first order predicate calculus cannot satisfy in the same time Löwenheim-Skolem for statements and compacity (Lindström 1). Effectively presented such systems cannot satisfy in the same time Löwenheim-Skolem for statements and the condition that the set of generally valid …

Speaker: Mihai Prunescu (University of Bucharest) Abstract: Regular logic systems which are strictly stronger than the first order predicate calculus cannot satisfy in the same time Löwenheim-Skolem for statements and compacity (Lindström 1). Effectively presented such systems cannot satisfy in the same time Löwenheim-Skolem for statements and the condition that the set of generally valid …