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Neighbourhood Structures: Bisimilarity and Basic Model Theory

Helle Hvid Hansen ; Clemens Kupke ; Eric Pacuit.

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&nbsp;[&hellip;]

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Stream Differential Equations: Specification Formats and Solution Methods

Helle Hvid Hansen ; Clemens Kupke ; Jan Rutten.

Streams, or infinite sequences, are infinite objects of a very simple type, yet they have a rich theory partly due to their ubiquity in mathematics and computer science. Stream differential equations are a coinductive method for specifying streams and stream operations, and their theory has been&nbsp;[&hellip;]

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