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Reduction: a new method of proving properties of systems of processes

When proving that a system of processes has a given property it is often convenient to assume that a routine is uninterruptible, i.e. that the routine cannot be interleaved with the rest of the system. Here sufficient conditions are obtained to show that the assumption that a routine is uninterruptible can be relaxed and still preserve basic properties such as halting and determinacy. Thus correctness proofs of a system of processes can often be greatly simplified. This technique - called reduction - is viewed as the replacement of an interruptible routine by an uninterruptible one.