In this paper we introduce the notion of an observational coalgebra structure and of a complete set of co-operations. We demonstrate in various example the usefulness of these notions, in particular, we show how they give rise to coalgebraic proof and definition principles.
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Elsevier B.V.
Electronic Notes in Theoretical Computer Science
Computer Security

Kupke, C., & Rutten, J. (2008). Observational coalgebras and complete sets of co-operations. Electronic Notes in Computer Science, 153–174.