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.