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» Generalized normal forms and polynomial system solving
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COLING
1992
14 years 10 months ago
A Generalized Greibach Normal Form for Definite Clause Grammars
An arbitrary definite clause grammar can be transforaled into a so-called Generalized Greibach Normal Form (GGNF), a generalization of the classical Greibach Normat Form (GNF) for...
Marc Dymetman
CASC
2007
Springer
124views Mathematics» more  CASC 2007»
15 years 1 months ago
A Full System of Invariants for Third-Order Linear Partial Differential Operators in General Form
We find a full system of invariants with respect to gauge transformations L g-1 Lg for third-order hyperbolic linear partial differential operators on the plane. The operators are...
Ekaterina Shemyakova, Franz Winkler
RTA
2010
Springer
14 years 11 months ago
Underspecified computation of normal forms
We consider the problem of computing, out of a set C of trees and a rewrite system R, those trees in C that cannot be rewritten into a tree in C. We solve this problem for sets of ...
Alexander Koller, Stefan Thater
ECAI
2006
Springer
15 years 1 months ago
A Solver for QBFs in Nonprenex Form
Various problems in AI can be solved by translating them into a quantified boolean formula (QBF) and evaluating the resulting encoding. In this approach, a QBF solver is used as a ...
Uwe Egly, Martina Seidl, Stefan Woltran
FSTTCS
2010
Springer
14 years 7 months ago
Uniqueness of Normal Forms is Decidable for Shallow Term Rewrite Systems
Uniqueness of normal forms (UN= ) is an important property of term rewrite systems. UN= is decidable for ground (i.e., variable-free) systems and undecidable in general. Recently ...
Nicholas Radcliffe, Rakesh M. Verma