1,654,562 research outputs found
Portability of Prolog programs: theory and case-studies
(Non-)portability of Prolog programs is widely considered as an important
factor in the lack of acceptance of the language. Since 1995, the core of the
language is covered by the ISO standard 13211-1. Since 2007, YAP and SWI-Prolog
have established a basic compatibility framework. This article describes and
evaluates this framework. The aim of the framework is running the same code on
both systems rather than migrating an application. We show that today, the
portability within the family of Edinburgh/Quintus derived Prolog
implementations is good enough to allow for maintaining portable real-world
applications.Comment: Online proceedings of the Joint Workshop on Implementation of
Constraint Logic Programming Systems and Logic-based Methods in Programming
Environments (CICLOPS-WLPE 2010), Edinburgh, Scotland, U.K., July 15, 201
The status and programs of the New Relativity Theory
A review of the most recent results of the New Relativity Theory is
presented. These include a straightforward derivation of the Black Hole
Entropy-Area relation and its corrections; the derivation of the
string uncertainty relations and generalizations ; ; the relation between the
four dimensional gravitational conformal anomaly and the fine structure
constant; the role of Noncommutative Geometry, Negative Probabilities and
Cantorian-Fractal spacetime in the Young's two-slit experiment. We then
generalize the recent construction of the Quenched-Minisuperspace bosonic
-brane propagator in dimensions ( [18]) to the full
multidimensional case involving all -branes : the construction of the
Multidimensional-Particle propagator in Clifford spaces (-spaces) associated
with a nested family of -loop histories living in a target -dim
background spacetime . We show how the effective -space geometry is related
to curvature of ordinary spacetime. The motion of rigid
particles/branes is studied to explain the natural of classical
spin. The relation among -space geometry and , Finsler Geometry
and (Braided) Quantum Groups is discussed. Some final remarks about the
Riemannian long distance limit of -space geometry are made.Comment: Tex file, 21 page
On cascade products of answer set programs
Describing complex objects by elementary ones is a common strategy in
mathematics and science in general. In their seminal 1965 paper, Kenneth Krohn
and John Rhodes showed that every finite deterministic automaton can be
represented (or "emulated") by a cascade product of very simple automata. This
led to an elegant algebraic theory of automata based on finite semigroups
(Krohn-Rhodes Theory). Surprisingly, by relating logic programs and automata,
we can show in this paper that the Krohn-Rhodes Theory is applicable in Answer
Set Programming (ASP). More precisely, we recast the concept of a cascade
product to ASP, and prove that every program can be represented by a product of
very simple programs, the reset and standard programs. Roughly, this implies
that the reset and standard programs are the basic building blocks of ASP with
respect to the cascade product. In a broader sense, this paper is a first step
towards an algebraic theory of products and networks of nonmonotonic reasoning
systems based on Krohn-Rhodes Theory, aiming at important open issues in ASP
and AI in general.Comment: Appears in Theory and Practice of Logic Programmin
Knowledge Compilation of Logic Programs Using Approximation Fixpoint Theory
To appear in Theory and Practice of Logic Programming (TPLP), Proceedings of
ICLP 2015
Recent advances in knowledge compilation introduced techniques to compile
\emph{positive} logic programs into propositional logic, essentially exploiting
the constructive nature of the least fixpoint computation. This approach has
several advantages over existing approaches: it maintains logical equivalence,
does not require (expensive) loop-breaking preprocessing or the introduction of
auxiliary variables, and significantly outperforms existing algorithms.
Unfortunately, this technique is limited to \emph{negation-free} programs. In
this paper, we show how to extend it to general logic programs under the
well-founded semantics.
We develop our work in approximation fixpoint theory, an algebraical
framework that unifies semantics of different logics. As such, our algebraical
results are also applicable to autoepistemic logic, default logic and abstract
dialectical frameworks
Microeconomic theory of the household and nutrition programs
Lack of food is no longer the major cause of malnutrition. Many households and individuals remain malnourished when income and supplies of food are adequate. Nutrition policy and programs must be based on a sound knowledge of household behaviour patterns. The microeconomic theory of the household focuses on the household's decisionmaking about scarce food resources based upon such considerations as: (i) the size of the family; (ii) the purchasing power of the family; (iii) the availability of healthful foods; (iv) the family's food preferences; (v) environmental variables (such as ethnic traditions and the homemaker's level of education); and finally (vi) family health (disease can limit the absorption of nutrients). Such determinants should be monitored to anticipate malnutrition problems unrelated to the food.Environmental Economics&Policies,Economic Theory&Research,Poverty Lines,Health Economics&Finance,Inequality
A General Framework for Sound and Complete Floyd-Hoare Logics
This paper presents an abstraction of Hoare logic to traced symmetric
monoidal categories, a very general framework for the theory of systems. Our
abstraction is based on a traced monoidal functor from an arbitrary traced
monoidal category into the category of pre-orders and monotone relations. We
give several examples of how our theory generalises usual Hoare logics (partial
correctness of while programs, partial correctness of pointer programs), and
provide some case studies on how it can be used to develop new Hoare logics
(run-time analysis of while programs and stream circuits).Comment: 27 page
Senses of Sen: Reflections on Amartya Sen’s Ideas of Justice
This review essay explores how Amartya Sen’s recent book, The Idea of Justice, is relevant and important for the development and assessment of transnational theories and applications to transnational justice and legal education programs. The essay captures a trans-jural dialogue of multinational scholars and teachers, discussing Sen’s contributions to moral justice theory (criticizing programs for “transcendental institutionalism” (like Rawlsian theory) and instead focusing on “comparative broadening” including empirical, relative, and comparative assessments of programs to ameliorate injustice in the world in its comparative concreteness (as in Indian social justice theory and Adam Smith’s Theory of Moral Sentiments and related work). The authors are professors in the transnational legal education program, the Center for Transnational Legal Studies, sponsored by over 25 different law schools, located in London. They teach courses in a wide variety of subjects, including comparative legal theory, constitutional law, business and legal ethics, moral and legal philosophy, international and comparative law, capital markets and business law, emergency powers, international dispute resolution and a variety of other common and civil law subjects
Studies of noise transmission in advanced composite material structures
Noise characteristics of advanced composite material fuselages were discussed from the standpoints of applicable research programs and noise transmission theory. Experimental verification of the theory was also included
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