This Festschrift volume contains papers presented at a conference, Prakash Fest, held in honor of Prakash Panangaden, in Oxford, UK, in May 2014, to celebrate his 60th birthday. Prakash Panangaden has worked on a large variety of topics including probabilistic and concurrent computation, logics and duality and quantum information and computation.

Layout Randomization and Nondeterminism.- Probabilistic Model Checking of Labelled Markov Processes via Finite Approximate Bisimulations.- An Operational Interpretation of Negative Probabilities and No-Signalling Models.- Bisimulation on Markov Processes over Arbitrary Measurable Spaces.- Probabilistic Model Checking for Energy-Utility Analysis.- (Co)Algebraic Characterizations of Signal Flow Graphs.- Fractal Sets as Final Coalgebras Obtained by Completing an Initial Algebra.- Leaving Traces: A Note on a Sound and Complete Trace Logic for Concurrent Constraint Programs.- Privacy from Accelerating Eavesdroppers: The Impact of Losses.- The Complexity of Computing a Bisimilarity Pseudometric on Probabilistic Automata.- From Haar to Lebesgue via Domain Theory.- Word Order Alternation in Sanskrit via Precyclicity in Pregroup Grammars.- The Logic of Entanglement.- Free Energy of Petri Nets.- Laudatio for Prakash Panangaden.- Generalized Differential Privacy: Regions of Priors That Admit Robust Optimal Mechanisms.- Bisimulation for Markov Decision Processes through Families of Functional Expressions.- Random Measurable Selections.- A Final Coalgebra for k-regular Sequences.- Automata Learning: A Categorical Perspective.- Optimal Coin Flipping.- Entanglement, Flow and Classical Simulatability in Measurement Based Quantum Computation.- Euclidean Representations of Quantum States.- TCC, with History.- Probabilistic and Quantum Event Structures.

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