Towards a Unified Theory of Intensional Logic Programming
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Here the Handbook of Abstracts
Handbook of the 4th World Congress and School on Universal Logic March 29 { April 07, 2013 Rio de Janeiro, Brazil UNILOG'2013 www.uni-log.org Edited by Jean-Yves B´eziau,Arthur Buchsbaum and Alexandre Costa-Leite Revised by Alvaro Altair Contents 1 Organizers of UNILOG'13 5 1.1 Scientific Committee . .5 1.2 Organizing Committee . .5 1.3 Supporting Organizers . .6 2 Aim of the event 6 3 4th World School on Universal Logic 8 3.1 Aim of the School . .8 3.2 Tutorials . .9 3.2.1 Why Study Logic? . .9 3.2.2 How to get your Logic Article or Book published in English9 3.2.3 Non-Deterministic Semantics . 10 3.2.4 Logic for the Blind as a Stimulus for the Design of Inno- vative Teaching Materials . 13 3.2.5 Hybrid Logics . 16 3.2.6 Psychology of Reasoning . 17 3.2.7 Truth-Values . 18 3.2.8 The Origin of Indian Logic and Indian Syllogism . 23 3.2.9 Logical Forms . 24 3.2.10 An Introduction to Arabic Logic . 25 3.2.11 Quantum Cognition . 27 3.2.12 Towards a General Theory of Classifications . 28 3.2.13 Connecting Logics . 30 3.2.14 Relativity of Mathematical Concepts . 32 3.2.15 Undecidability and Incompleteness are Everywhere . 33 3.2.16 Logic, Algebra and Implication . 33 3.2.17 Hypersequents and Applications . 35 3.2.18 Introduction to Modern Mathematics . 36 3.2.19 Erotetic Logics . 37 3.2.20 History of Paraconsistent Logic . 38 3.2.21 Institutions . -
Abstract 1. Russell As a Mereologist
THE 1900 TURN IN BERTRAND RUSSELL’S LOGIC, THE EMERGENCE OF HIS PARADOX, AND THE WAY OUT Prof. Dr. Nikolay Milkov, Universität Paderborn, [email protected] Abstract Russell‘s initial project in philosophy (1898) was to make mathematics rigorous reducing it to logic. Before August 1900, however, Russell‘s logic was nothing but mereology. First, his acquaintance with Peano‘s ideas in August 1900 led him to discard the part-whole logic and accept a kind of intensional predicate logic instead. Among other things, the predicate logic helped Russell embrace a technique of treating the paradox of infinite numbers with the help of a singular concept, which he called ‗denoting phrase‘. Unfortunately, a new paradox emerged soon: that of classes. The main contention of this paper is that Russell‘s new con- ception only transferred the paradox of infinity from the realm of infinite numbers to that of class-inclusion. Russell‘s long-elaborated solution to his paradox developed between 1905 and 1908 was nothing but to set aside of some of the ideas he adopted with his turn of August 1900: (i) With the Theory of Descriptions, he reintroduced the complexes we are acquainted with in logic. In this way, he partly restored the pre-August 1900 mereology of complexes and sim- ples. (ii) The elimination of classes, with the help of the ‗substitutional theory‘,1 and of prop- ositions, by means of the Multiple Relation Theory of Judgment,2 completed this process. 1. Russell as a Mereologist In 1898, Russell abandoned his short period of adherence to the Neo-Hegelian position in the philosophy of mathematics and replaced it with what can be called the ‗analytic philoso- phy of mathematics‘, substantiated by the logic of relations. -
Logic-Based Technologies for Intelligent Systems: State of the Art and Perspectives
information Article Logic-Based Technologies for Intelligent Systems: State of the Art and Perspectives Roberta Calegari 1,* , Giovanni Ciatto 2 , Enrico Denti 3 and Andrea Omicini 2 1 Alma AI—Alma Mater Research Institute for Human-Centered Artificial Intelligence, Alma Mater Studiorum–Università di Bologna, 40121 Bologna, Italy 2 Dipartimento di Informatica–Scienza e Ingegneria (DISI), Alma Mater Studiorum–Università di Bologna, 47522 Cesena, Italy; [email protected] (G.C.); [email protected] (A.O.) 3 Dipartimento di Informatica–Scienza e Ingegneria (DISI), Alma Mater Studiorum–Università di Bologna, 40136 Bologna, Italy; [email protected] * Correspondence: [email protected] Received: 25 February 2020; Accepted: 18 March 2020; Published: 22 March 2020 Abstract: Together with the disruptive development of modern sub-symbolic approaches to artificial intelligence (AI), symbolic approaches to classical AI are re-gaining momentum, as more and more researchers exploit their potential to make AI more comprehensible, explainable, and therefore trustworthy. Since logic-based approaches lay at the core of symbolic AI, summarizing their state of the art is of paramount importance now more than ever, in order to identify trends, benefits, key features, gaps, and limitations of the techniques proposed so far, as well as to identify promising research perspectives. Along this line, this paper provides an overview of logic-based approaches and technologies by sketching their evolution and pointing out their main application areas. Future perspectives for exploitation of logic-based technologies are discussed as well, in order to identify those research fields that deserve more attention, considering the areas that already exploit logic-based approaches as well as those that are more likely to adopt logic-based approaches in the future. -
Intensional Models for the Theory of Types∗
Intensional Models for the Theory of Types∗ Reinhard Muskens Abstract In this paper we define intensional models for the classical theory of types, thus arriving at an intensional type logic ITL. Intensional models generalize Henkin's general models and have a natural definition. As a class they do not validate the axiom of Extensionality. We give a cut-free sequent calculus for type theory and show completeness of this calculus with respect to the class of intensional models via a model existence theo- rem. After this we turn our attention to applications. Firstly, it is argued that, since ITL is truly intensional, it can be used to model ascriptions of propositional attitude without predicting logical omniscience. In order to illustrate this a small fragment of English is defined and provided with an ITL semantics. Secondly, it is shown that ITL models contain certain objects that can be identified with possible worlds. Essential elements of modal logic become available within classical type theory once the axiom of Extensionality is given up. 1 Introduction The axiom scheme of Extensionality states that whenever two predicates or relations are coextensive they must have the same properties: 8XY (8~x(X~x $ Y ~x) ! 8Z(ZX ! ZY )) (1) Historically Extensionality has always been problematic, the main problem be- ing that in many areas of application, though not perhaps in the foundations of mathematics, the statement is simply false. This was recognized by White- head and Russell in Principia Mathematica [32], where intensional functions such as `A believes that p' or `it is a strange coincidence that p' are discussed at length. -
Frege and the Logic of Sense and Reference
FREGE AND THE LOGIC OF SENSE AND REFERENCE Kevin C. Klement Routledge New York & London Published in 2002 by Routledge 29 West 35th Street New York, NY 10001 Published in Great Britain by Routledge 11 New Fetter Lane London EC4P 4EE Routledge is an imprint of the Taylor & Francis Group Printed in the United States of America on acid-free paper. Copyright © 2002 by Kevin C. Klement All rights reserved. No part of this book may be reprinted or reproduced or utilized in any form or by any electronic, mechanical or other means, now known or hereafter invented, including photocopying and recording, or in any infomration storage or retrieval system, without permission in writing from the publisher. 10 9 8 7 6 5 4 3 2 1 Library of Congress Cataloging-in-Publication Data Klement, Kevin C., 1974– Frege and the logic of sense and reference / by Kevin Klement. p. cm — (Studies in philosophy) Includes bibliographical references and index ISBN 0-415-93790-6 1. Frege, Gottlob, 1848–1925. 2. Sense (Philosophy) 3. Reference (Philosophy) I. Title II. Studies in philosophy (New York, N. Y.) B3245.F24 K54 2001 12'.68'092—dc21 2001048169 Contents Page Preface ix Abbreviations xiii 1. The Need for a Logical Calculus for the Theory of Sinn and Bedeutung 3 Introduction 3 Frege’s Project: Logicism and the Notion of Begriffsschrift 4 The Theory of Sinn and Bedeutung 8 The Limitations of the Begriffsschrift 14 Filling the Gap 21 2. The Logic of the Grundgesetze 25 Logical Language and the Content of Logic 25 Functionality and Predication 28 Quantifiers and Gothic Letters 32 Roman Letters: An Alternative Notation for Generality 38 Value-Ranges and Extensions of Concepts 42 The Syntactic Rules of the Begriffsschrift 44 The Axiomatization of Frege’s System 49 Responses to the Paradox 56 v vi Contents 3. -
Analyticity, Necessity and Belief Aspects of Two-Dimensional Semantics
!"# #$%"" &'( ( )#"% * +, %- ( * %. ( %/* %0 * ( +, %. % +, % %0 ( 1 2 % ( %/ %+ ( ( %/ ( %/ ( ( 1 ( ( ( % "# 344%%4 253333 #6#787 /0.' 9'# 86' 8" /0.' 9'# 86' (#"8'# Analyticity, Necessity and Belief Aspects of two-dimensional semantics Eric Johannesson c Eric Johannesson, Stockholm 2017 ISBN print 978-91-7649-776-0 ISBN PDF 978-91-7649-777-7 Printed by Universitetsservice US-AB, Stockholm 2017 Distributor: Department of Philosophy, Stockholm University Cover photo: the water at Petite Terre, Guadeloupe 2016 Contents Acknowledgments v 1 Introduction 1 2 Modal logic 7 2.1Introduction.......................... 7 2.2Basicmodallogic....................... 13 2.3Non-denotingterms..................... 21 2.4Chaptersummary...................... 23 3 Two-dimensionalism 25 3.1Introduction.......................... 25 3.2Basictemporallogic..................... 27 3.3 Adding the now operator.................. 29 3.4Addingtheactualityoperator................ 32 3.5 Descriptivism ......................... 34 3.6Theanalytic/syntheticdistinction............. 40 3.7 Descriptivist 2D-semantics .................. 42 3.8 Causal descriptivism ..................... 49 3.9Meta-semantictwo-dimensionalism............. 50 3.10Epistemictwo-dimensionalism................ 54 -
Axiomatization of Logic. Truth and Proof. Resolution
H250: Honors Colloquium – Introduction to Computation Axiomatization of Logic. Truth and Proof. Resolution Marius Minea [email protected] How many do we need? (best: few) Are they enough? Can we prove everything? Axiomatization helps answer these questions Motivation: Determining Truth In CS250, we started with truth table proofs. Propositional formula: can always do truth table (even if large) Predicate formula: can’t do truth tables (infinite possibilities) ⇒ must use other proof rules Motivation: Determining Truth In CS250, we started with truth table proofs. Propositional formula: can always do truth table (even if large) Predicate formula: can’t do truth tables (infinite possibilities) ⇒ must use other proof rules How many do we need? (best: few) Are they enough? Can we prove everything? Axiomatization helps answer these questions Symbols of propositional logic: propositions: p, q, r (usually lowercase letters) operators (logical connectives): negation ¬, implication → parentheses () Formulas of propositional logic: defined by structural induction (how to build complex formulas from simpler ones) A formula (compound proposition) is: any proposition (aka atomic formula or variable) (¬α) where α is a formula (α → β) if α and β are formulas Implication and negation suffice! First, Define Syntax We define a language by its symbols and the rules to correctly combine symbols (the syntax) Formulas of propositional logic: defined by structural induction (how to build complex formulas from simpler ones) A formula (compound proposition) is: any -
A Program for the Semantics of Science
MARIO BUNGE A PROGRAM FOR THE SEMANTICS OF SCIENCE I. PROBLEM, METHOD AND GOAL So far exact semantics has been successful only in relation to logic and mathematics. It has had little if anything to say about factual or empirical science. Indeed, no semantical theory supplies an exact and adequate elucidation and systematization of the intuitive notions of factual referen- ce and factual representation, or of factual sense and partial truth of fact, which are peculiar to factual science and therefore central to its philosophy. The semantics of first order logic and the semantics of mathematics (i.e., model theory) do not handle those semantical notions, for they are not interested in external reference and in partial satisfaction. On the other hand factual science is not concerned with interpreting a theory in terms of another theory but in interpreting a theory by reference to things in the real world and their properties. Surely there have been attempts to tackle the semantic peculiarities of factual science. However, the results are rather poor. We have either vigorous intuitions that remain half-baked and scattered, or rigorous formalisms that are irrelevant to real science. The failure to pass from intuition to theory suggests that semanticists have not dealt with genuine factual science but with some oversimplified images of it, such as the view that a scientific theory is just a special case of set theory, so that model theory accounts for factual meaning and for truth of fact. If we wish to do justice to the semantic peculiarities of factual science we must not attempt to force it into any preconceived Procrustean bed: we must proceed from within science. -
The History of Formal Semantics, Going Beyond What I Know First-Hand
!"#$"##% Introduction ! “Semantics” can mean many different things, since there are many ways to be interested in “meaning”. One 20th century debate: how much common ground across logic, philosophy, and linguistics? The History of ! Formal semantics, which says “much!”, has been shaped over the last 40+ years by fruitful interdisciplinary collaboration among linguists, Formal Semantics philosophers, and logicians. ! In this talk I’ll reflect mainly on the development of formal semantics and to a lesser extent on formal pragmatics in linguistics and philosophy starting in the 1960’s. Barbara H. Partee ! I’ll describe some of the innovations and “big ideas” that have shaped the MGU, May 14, 2011 development of formal semantics and its relation to syntax and to (= Lecture 13, Formal Semantics Spec-kurs) pragmatics, and draw connections with foundational issues in linguistic theory, philosophy, and cognitive science. May 2011 MGU 2 Introduction “Semantics” can mean many different things ! I’m not trained as a historian of linguistics (yet) or of philosophy; what I know best comes from my experience as a graduate student of Chomsky’s ! “Semantics” used to mean quite different things to linguists in syntax at M.I.T. (1961-65), then as a junior colleague of Montague’s at and philosophers, not surprisingly, since different fields have UCLA starting in 1965, and then, after his untimely death in 1971, as one different central concerns. of a number of linguists and philosophers working to bring Montague’s " Philosophers of language have long been concerned with truth and semantics and Chomskyan syntax together, an effort that Chomsky reference, with logic, with how compositionality works, with how himself was deeply skeptical about. -
Towards a Unified Theory of Intensional Logic Programming
J. LOGIC PROGRAMMING 1992:13:413-440 413 TOWARDS A UNIFIED THEORY OF INTENSIONAL LOGIC PROGRAMMING MEHMET A. ORGUN AND WILLIAM W. WADGE D Intensional Logic Programming is a new form of logic programming based on intensional logic and possible worlds semantics. Intensional logic allows us to use logic programming to specify nonterminating computations and to capture the dynamic aspects of certain problems in a natural and problem-oriented style. The meanings of formulas of an intensional first- order language are given according to intensional interpretations and to elements of a set of possible worlds. Neighborhood semantics is employed as an abstract formulation of the denotations of intensional operators. Then we investigate general properties of intensional operators such as universality, monotonicity, finitariness and conjunctivity. These properties are used as constraints on intensional logic programming systems. The model-theoretic and fixpoint semantics of intensional logic programs are developed in terms of least (minimum) intensional Herbrand models. We show in particular that our results apply to a number of intensional logic programming languages such as Chronolog proposed by Wadge and Tem- plog by Abadi and Manna. We consider some elementary extensions to the theory and show that intensional logic program clauses can be used to define new intensional operators. Intensional logic programs with inten- sional operator definitions are regarded as metatheories. a 1. INTRODUCTION Intensional logic programming (ILP) is a new form of logic programming based on intensional logic and possible world semantics. Intensional logic [20] allows us to describe context-dependent properties of certain problems in a natural and prob- Address correspondence to M. -
Logic for Problem Solving
LOGIC FOR PROBLEM SOLVING Robert Kowalski Imperial College London 12 October 2014 PREFACE It has been fascinating to reflect and comment on the way the topics addressed in this book have developed over the past 40 years or so, since the first version of the book appeared as lecture notes in 1974. Many of the developments have had an impact, not only in computing, but also more widely in such fields as math- ematical, philosophical and informal logic. But just as interesting (and perhaps more important) some of these developments have taken different directions from the ones that I anticipated at the time. I have organised my comments, chapter by chapter, at the end of the book, leaving the 1979 text intact. This should make it easier to compare the state of the subject in 1979 with the subsequent developments that I refer to in my commentary. Although the main purpose of the commentary is to look back over the past 40 years or so, I hope that these reflections will also help to point the way to future directions of work. In particular, I remain confident that the logic-based approach to knowledge representation and problem solving that is the topic of this book will continue to contribute to the improvement of both computer and human intelligence for a considerable time into the future. SUMMARY When I was writing this book, I was clear about the problem-solving interpretation of Horn clauses, and I knew that Horn clauses needed to be extended. However, I did not know what extensions would be most important. -
The Logic of Sense and Reference
The Logic of Sense and Reference Reinhard Muskens Tilburg Center for Logic and Philosophy of Science (TiLPS) ESSLLI 2009, Day 1 Reinhard Muskens (TiLPS) The Logic of Sense and Reference ESSLLI 2009, Day 1 1 / 37 The Logic of Sense and Reference In this course we look at the problem of the individuation of meaning. Many semantic theories do not individuate meanings finely enough and as a consequence make wrong predictions. We will discuss strategies to arrive at fine-grained theories of meaning. They will be illustrated mainly (though not exclusively) on the basis of my work. Strategies that can be implemented in standard higher order logic will be investigated, but generalisations of that logic that help deal with the problem will be considered too. Today I'll focus on explaining the problem itself and will mention some general strategies to deal with it. One of these (that of Thomason 1980) will be worked out in slightly more detail. Reinhard Muskens (TiLPS) The Logic of Sense and Reference ESSLLI 2009, Day 1 2 / 37 But we can form theories of meaning. Lewis (1972): In order to say what a meaning is, we may first ask what a meaning does, and then find something that does that. In today's talk I want to highlight some properties that meanings seem to have. If we want to find things that behave similarly they will need to have these properties too. In particular, I will look at the individuation of meaning. When are the meanings of two expressions identical? Or, in other words, what is synonymy? Introduction What is Meaning? And what is Synonymy? What is meaning? The question is not easy to answer.