This book constitutes the thoroughly refereed post-proceedings of the 11th International Workshop on Coalgebraic Methods in Computer Science, CMCS 2012, colocated with ETAPS 2012, held in Tallin, Estonia, in March/April 2012. The papers cover a wide range of topics in the theory, logics and applications of coalgebras.

From Lawvere to Brandenburger-Keisler: Interactive Forms of Diagonalization and Self-reference.- Defining Context-Free Power Series Coalgebraically.- Relational Presheaves as Labelled Transition Systems.- On Finitary Functors and Their Presentations.- Structural Operational Semantics for Continuous State Probabilistic Processes.- Stream Automata Are Coalgebras.- Trace Semantics via Determinizatio.- An Alpha-Corecursion Principle for the Infinitary Lambda Calculus.- Lax Extensions of Coalgebra Functors.- From Transitions to Executions.- Tracing the Man in the Middle in Monoidal Categories.- Permutations in Coinductive Graph Representation.- Internal Models for Coalgebraic Modal Logics.

This book constitutes the thoroughly refereed post-proceedings of the 11th International Workshop on Coalgebraic Methods in Computer Science, CMCS 2012, colocated with ETAPS 2012, held in Tallin, Estonia, in March/April 2012. The 10 revised full papers were carefully reviewed and selected from 23 submissions. Also included are three invited talks. The papers cover a wide range of topics in the theory, logics and applications of coalgebras.

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