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Neighbourhood Structures: Bisimilarity and Basic Model Theory

Neighbourhood Structures: Bisimilarity and Basic Model Theory

Neighbourhood structures are the standard semantic tool used to reason about non-normal modal logics. The logic of all neighbourhood models is called classical modal logic. In coalgebraic terms, a neighbourhood frame is a coalgebra for the contravariant powerset functor composed with itself, denoted by 2^2. We use this coalgebraic modelling …