Title
Syntactic Definitions of Undefined: On Defining the Undefined
Abstract
In the A-calculus, there is a standard notion of what terms should be considered to be "undefined": the unsolvable terms. There are various equivalent characterisations of this property of terms. We attempt to find a similar notion for orthogonal term rewrite systems. We find that in general the properties of terms analogous to the various characterisations of solvabil- ity differ. We give two axioms that a notion of undefinedness should satisfy, and explore some of their consequences. The axioms lead to a concept analogous to the BShm trees of the A-calculus. Each term has a unique B5hm tree, and the set of such trees forms a domain which provides a denotational semantics for the rewrite system. We consider several particular notions of undefinedness satisfying the axioms, and compare them.
Year
DOI
Venue
1994
10.1007/3-540-57887-0_114
TACS
Keywords
Field
DocType
syntactic definitions,satisfiability
Algebra,Computer science,Algorithm,Syntax
Conference
ISBN
Citations 
PageRank 
3-540-57887-0
12
1.03
References 
Authors
3
5
Name
Order
Citations
PageRank
Zena M. Ariola148238.61
Richard Kennaway243547.65
Jan Willem Kop3121.03
M. Ronan Sleep417831.24
Fer-Jan de Vries524421.67