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COMPGEOM
2001
ACM
15 years 1 months ago
Computing a 3-dimensional cell in an arrangement of quadrics: exactly and actually!
We present two approaches to the problem of calculating a cell in a 3-dimensional arrangement of quadrics. The first approach solves the problem using rational arithmetic. It work...
Nicola Geismann, Michael Hemmer, Elmar Schöme...
ENTCS
2002
125views more  ENTCS 2002»
14 years 9 months ago
Specification of Logic Programming Languages from Reusable Semantic Building Blocks
We present a Language Prototyping System that facilitates the modular development of interpreters from independent semantic buildks. The abstract syntax is modelled as the fixpoint...
José Emilio Labra Gayo, Juan Manuel Cueva L...
BIRTHDAY
1997
Springer
15 years 2 months ago
Expressive Power of Unary Counters
We compare the expressive power on finite models of two extensions of first order logic L with equality. L(Ct) is formed by adding an operator count{x : ϕ}, which builds a term ...
Michael Benedikt, H. Jerome Keisler
JSYML
2006
85views more  JSYML 2006»
14 years 9 months ago
An alternative semantics for quantified relevant logic
The quantified relevant logic RQ is given a new semantics in which a formula xA is true when there is some true proposition that implies all x-instantiations of A. Formulae are mo...
Robert Goldblatt, Edwin D. Mares
ISAAC
2007
Springer
158views Algorithms» more  ISAAC 2007»
15 years 4 months ago
On the Expressive Power of Planar Perfect Matching and Permanents of Bounded Treewidth Matrices
Valiant introduced some 25 years ago an algebraic model of computation along with the complexity classes VP and VNP, which can be viewed as analogues of the classical classes P and...
Uffe Flarup, Pascal Koiran, Laurent Lyaudet