A collection of contributions on programming theory in computer science and mathematics, celebrating the work of Edsger W. Dijkstra.

Inhalt
0 Proving Termination of Parallel Programs.- 1 On a Relation on Functions.- 2 Efficient Solution of a Non-Monotonic Inverse Problem.- 3 Semantics of Quasi-Boolean Expressions.- 4 Small Specification Exercises.- 5 Architecture of Real-Time Systems.- 6 The Use of a Formal Simulator to Verify a Simple Real Time Control Program.- 7 Exploring the Future: Trends and Discontinuities.- 8 On a Renewed Visit to the Banker and a Remarkable Analogy.- 9 On Bounded Buffers: Modularity, Robustness, and Reliability in Reactive Systems.- 10 Examples in Program Composition.- 11 On the Mechanism of the Hydrogenation of Edible Oils.- 12 The Problem of the Majority Network.- 13 A Little Exercise in Deriving Multiprograms.- 14 Experimenting with a Refinement Calculus.- 15 Serializable Programs, Parallelizable Assertions: A Basis for Interleaving.- 16 Binary to Decimal, One More Time.- 17 Rotate and Double.- 18 Beautifying Gödel.- 19 A Striptease of Entropy.- 20 On a Theorem of Jacobson.- 21 Modalities of Nondeterminacy.- 22 A Theory for the Derivation of C-mos Circuit Designs.- 23 On Mathematical Induction and the Invariance Theorem.- 24 Formalizing Some Classic Synchronization Primitives.- 25 Consequences.- 26 Shortest and Longest Segments.- 27 A Simple Program Whose Proof Isn't.- 28 Binding Structure and Behaviour in Whole Net Concurrency Semantics.- 29 Maximal Strong Components: An Exercise in Program Presentation.- 30 A Systolic Program for Gauss-Jordan Elimination.- 31 Coding for Channels with Localized Errors.- 32 Topology-Independent Algorithms Based on Spanning Trees.- 33 An Exercise in the Verification of Multi-Process Programs.- 34 The Limitations to Delay-Insensitivity in Asynchronous Circuits.- 35 A Simple Proof of a Simple Consensus Algorithm.- 36 Of wp and CSP.- 37Programming by Expression Refinement: the KMP Algorithm.- 38 Methodical Competitive Snoopy-Caching.- 39 Beauty and the Beast of Software Complexity Elegance versus Elephants.- 40 A Note on Feasibility.- 41 A Curious Property of Points and Circles in the Plane.- 42 A Problem Involving Subsequences.- 43 A Personal Perspective of the Alpern-Schneider Characterization of Safety and Liveness.- 44 Simpler Proofs for Concurrent Reading and Writing.- 45 Goodbye Junctivity?.- 46 An Assignment Problem for the Vertices of a Cycle.- 47 Duality and De Morgan Principles for Lists.- 48 The Quest for Timeless Specifications Leads to Non-Stepping Automata.- 49 The Maximum Length of a Palindrome in a Sequence.- 50 On Form, Formalism and Equivalence.- 51 Drawing Lines, Circles, and Ellipses in a Raster.- 52 Calculations with Relations, an Example.- 53 Two Proofs for Pythagoras.