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[top ][top ]-closed relations and admissibility

Published online by Cambridge University Press:  01 June 2000

MARTÍN ABADI
Affiliation:
Bell Labs Research, Lucent Technologies, 3180 Porter Drive, Palo Alto, California 94304, USA

Abstract

While developing a method for reasoning about programs, Pitts defined the [top ][top ]-closed relations as an alternative to the standard admissible relations. This paper reformulates and studies Pitts's operational concept of [top ][top ]-closure in a semantic framework. It investigates the non-trivial connection between [top ][top ]-closure and admissibility, showing that [top ][top ]-closure is strictly stronger than admissibility and that every [top ][top ]-closed relation corresponds to an admissible preorder.

Type
Research Article
Copyright
2000 Cambridge University Press

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