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T.: Persistent Constraints in Constraint Handling Rules

By Hariolf Betz, Frank Raiser and Thom Frühwirth


Abstract. In the most abstract definition of its operational semantics, the declarative and concurrent programming language CHR is trivially non-terminating for a significant class of programs. Common refinements of this definition, in closing the gap to real-world implementations, compromise on declarativity and/or concurrency. Building on recent work and the notion of persistent constraints, we introduce an operational semantics avoiding trivial non-termination without compromising on its essential features.

Year: 2009
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