A Theory of Communicating Sequential Processes
Journal of the ACM (JACM)
Communications of the ACM
Kleene's three valued logics and their children
Fundamenta Informaticae
Process algebra and conditional composition
Information Processing Letters
ACM Transactions on Computational Logic (TOCL)
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We study two alternative bases for Belnap's four-valued logic and provide complete equational axiomatizations for them. One is called conditional composition logic. It has a single, ternary if-then-else connective with a sequential, operational reading, and four constants for the truth values. The other logic is called guard logic. The main motivation for this logic lies in its technical properties. It admits a useful type of canonical form (term representation), and a relatively simple strategy for equational reasoning.