Algebraic laws for nondeterminism and concurrency

@article{Hennessy1985AlgebraicLF,
  title={Algebraic laws for nondeterminism and concurrency},
  author={Matthew C. B. Hennessy and Robin Milner},
  journal={J. ACM},
  year={1985},
  volume={32},
  pages={137-161}
}
Since a nondeterministic and concurrent program may, in general, communicate repeatedly with its environment, its meaning cannot be presented naturally as an input/output function (as is often done in the denotational approach to semantics). In this paper, an alternative is put forth. First, a definition is given of what it is for two programs or program parts to be equivalent for all observers; then two program parts are said to be observation congruent if they are, in all program contexts… 

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