Many real systems consist of a number of physically distributed components that work independently using their private storage, but also communicate from time to time by explicit message passing. Such systems are called distributed systems. An example is an airline reservation system consisting of a large number of terminals in many different travel agencies and a central database for keeping the current status of all flights. Here the database and the terminals are the components of the system, and communication is possible between each terminal and the database.
KeywordsProof System Good Computation Parallel Composition Main Loop Total Correctness
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