Undefinedness vs. underspecification in HALDEN ASL
Nordic Journal of Computing
A Sound Assertion Semantics for the Dependable Systems Evolution Verifying Compiler
ICSE '07 Proceedings of the 29th international conference on Software Engineering
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We use the appeal of simplicity and an aversion to complexity in selecting a method for handling partial functions in logic. We conclude that avoiding the undefined by using underspecification is the preferred choice.