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BWS Newsletter No 18 24/11/2015, 20:45
BWS Newsletter no 18 24/11/2015, 20:45 From: British Wittgenstein Society [[email protected]] Subject: Newsletter no.18 BWS website home August 2013 BWS Newsletter Issue no 18 Contents Nota Bene The Wittgenstein-Skinner Archive Pdf version (216 kb) Nota Bene Arthur Gibson on Wittgenstein’s Conferences rediscovered archive Around the world Wittgenstein postings In early October 1941 German bombers Lecture series attacked Oakington RAF base. Victims Pastures new were rushed to hospital in Cambridge. Housekeeping The only slightly later admission of a Executive Committee polio patient was unnoticed, by-passed, being left untreated for very many hours in a corridor. This is how Wittgenstein’s closest friend Francis Skinner came to die at the age of 29. About BWS Within the week of Skinner’s funeral, in a state of trauma, Ludwig attempted to resign his Philosophy Chair; arranged to leave Cambridge for Guy’s Hospital working to fulfil his, now memorial, plan with Francis; attended Francis’ funeral; reclaimed from Skinner’s family the Wittgenstein- BWS is a British focal point for research and exchange Skinner Archive, and posted them to Skinner’s school of ideas among Wittgenstein scholars and students friend, Reuben Goodstein. Eventually Goodstein gave the throughout the world. Archive to the Mathematical Association. It was a much- appreciated invitation from the Association (and full This Newsletter will be sent exclusively to members of acknowledgement to it in references here), with the the BWS, on a regular basis, in order to draw attention support of Trinity College, for me to research and prepare to updates on the website, or to share as yet unpublished this unpublished Archive for book publication. -
Självständiga Arbeten I Matematik
SJÄLVSTÄNDIGA ARBETEN I MATEMATIK MATEMATISKA INSTITUTIONEN, STOCKHOLMS UNIVERSITET An introduction to Goodstein’s theorem av Anton Christenson 2019 - No K38 MATEMATISKA INSTITUTIONEN, STOCKHOLMS UNIVERSITET, 106 91 STOCKHOLM An introduction to Goodstein’s theorem Anton Christenson Självständigt arbete i matematik 15 högskolepoäng, grundnivå Handledare: Paul Vaderlind 2019 Abstract Goodstein’s theorem is a statement about the natural numbers, proved by Reuben Goodstein in 1944, and shown to be independent of Peano Arithmetic by Laurence Kirby and Jeff Paris in 1982. We give an intro- duction to the theorem, as well as a basic description of the two first-order theories (Peano Arithmetic and Zermelo Fraenkel set theory) relevant to our discussion of the theorem and its independence. We then develop the theory of well-ordered sets and ordinal numbers, leading in the end to a simple proof of Goodstein’s theorem. 1 Contents 1 Introduction 3 1.1 Complete base-n representations . 3 1.2 Goodstein sequences . 4 2 Prerequisites and historical context 6 2.1 Peano Arithmetic . 6 2.2 Zermelo-Fraenkel set theory . 7 2.3 Natural numbers as sets . 9 2.4 Is ZF more powerful than PA?.................... 10 2.5 History . 11 3 Well-ordered sets 11 3.1 Definition and examples . 11 3.2 Order isomorphism and initial segments . 13 3.3 Arithmetic . 13 4 Ordinal numbers 18 4.1 Counting beyond infinity . 19 4.2 Ordinals as sets . 20 4.3 Successor and limit ordinals . 22 4.4 Least upper bounds and order types . 22 4.5 Transfinite induction and recursion . 23 4.6 Ordinal arithmetic . -
The Development of Mathematical Logic from Russell to Tarski: 1900–1935
The Development of Mathematical Logic from Russell to Tarski: 1900–1935 Paolo Mancosu Richard Zach Calixto Badesa The Development of Mathematical Logic from Russell to Tarski: 1900–1935 Paolo Mancosu (University of California, Berkeley) Richard Zach (University of Calgary) Calixto Badesa (Universitat de Barcelona) Final Draft—May 2004 To appear in: Leila Haaparanta, ed., The Development of Modern Logic. New York and Oxford: Oxford University Press, 2004 Contents Contents i Introduction 1 1 Itinerary I: Metatheoretical Properties of Axiomatic Systems 3 1.1 Introduction . 3 1.2 Peano’s school on the logical structure of theories . 4 1.3 Hilbert on axiomatization . 8 1.4 Completeness and categoricity in the work of Veblen and Huntington . 10 1.5 Truth in a structure . 12 2 Itinerary II: Bertrand Russell’s Mathematical Logic 15 2.1 From the Paris congress to the Principles of Mathematics 1900–1903 . 15 2.2 Russell and Poincar´e on predicativity . 19 2.3 On Denoting . 21 2.4 Russell’s ramified type theory . 22 2.5 The logic of Principia ......................... 25 2.6 Further developments . 26 3 Itinerary III: Zermelo’s Axiomatization of Set Theory and Re- lated Foundational Issues 29 3.1 The debate on the axiom of choice . 29 3.2 Zermelo’s axiomatization of set theory . 32 3.3 The discussion on the notion of “definit” . 35 3.4 Metatheoretical studies of Zermelo’s axiomatization . 38 4 Itinerary IV: The Theory of Relatives and Lowenheim’s¨ Theorem 41 4.1 Theory of relatives and model theory . 41 4.2 The logic of relatives . -
A Functional Hitchhiker's Guide to Hereditarily Finite Sets, Ackermann
A Functional Hitchhiker’s Guide to Hereditarily Finite Sets, Ackermann Encodings and Pairing Functions – unpublished draft – Paul Tarau Department of Computer Science and Engineering University of North Texas [email protected] Abstract interest in various fields, from representing structured data The paper is organized as a self-contained literate Haskell in databases (Leontjev and Sazonov 2000) to reasoning with program that implements elements of an executable fi- sets and set constraints in a Logic Programming framework nite set theory with focus on combinatorial generation and (Dovier et al. 2000; Piazza and Policriti 2004; Dovier et al. arithmetic encodings. The code, tested under GHC 6.6.1, 2001). is available at http://logic.csci.unt.edu/tarau/ The Universe of Hereditarily Finite Sets is built from the research/2008/fSET.zip. empty set (or a set of Urelements) by successively applying We introduce ranking and unranking functions generaliz- powerset and set union operations. A surprising bijection, ing Ackermann’s encoding to the universe of Hereditarily Fi- discovered by Wilhelm Ackermann in 1937 (Ackermann nite Sets with Urelements. Then we build a lazy enumerator 1937; Abian and Lamacchia 1978; Kaye and Wong 2007) for Hereditarily Finite Sets with Urelements that matches the from Hereditarily Finite Sets to Natural Numbers, was the unranking function provided by the inverse of Ackermann’s original trigger for our work on building in a mathematically encoding and we describe functors between them resulting elegant programming language, a concise and executable in arithmetic encodings for powersets, hypergraphs, ordinals hereditarily finite set theory. The arbitrary size of the data and choice functions. -
A Theory of Particular Sets, As It Uses Open Formulas Rather Than Sequents
A Theory of Particular Sets Paul Blain Levy, University of Birmingham June 14, 2019 Abstract ZFC has sentences that quantify over all sets or all ordinals, without restriction. Some have argued that sen- tences of this kind lack a determinate meaning. We propose a set theory called TOPS, using Natural Deduction, that avoids this problem by speaking only about particular sets. 1 Introduction ZFC has long been established as a set-theoretic foundation of mathematics, but concerns about its meaningfulness have often been raised. Specifically, its use of unrestricted quantifiers seems to presuppose an absolute totality of sets. The purpose of this paper is to present a new set theory called TOPS that addresses this concern by speaking only about particular sets. Though weaker than ZFC, it is adequate for a large amount of mathematics. To explain the need for a new theory, we begin in Section 2 by surveying some basic mathematical beliefs and conceptions. Section 3 presents the language of TOPS, and Section 4 the theory itself, using Natural Deduction. Section 5 adapts the theory to allow theorems with free variables. Related work is discussed in Section 6. While TOPS is by no means the first set theory to use restricted quantifiers in order to avoid assuming a totality of sets, it is the first to do so using Natural Deduction, which turns out to be very helpful. This is apparent when TOPS is compared to a previously studied system [26] that proves essentially the same sentences but includes an inference rule that (we argue) cannot be considered truth-preserving. -
Sets As Graphs
Universita` degli Studi di Udine Dipartimento di Matematica e Informatica Dottorato di Ricerca in Informatica XXIV Ciclo - Anno Accademico 2011-2012 Ph.D. Thesis Sets as Graphs Candidate: Supervisors: Alexandru Ioan Tomescu Alberto Policriti Eugenio G. Omodeo December 2011 Tesi di dottorato di Alexandru Ioan Tomescu, discussa presso l'Universit`adegli Studi di Udine Author's e-mail: [email protected] Author's address: Dipartimento di Matematica e Informatica Universit`adegli Studi di Udine Via delle Scienze, 206 33100 Udine Italia Tesi di dottorato di Alexandru Ioan Tomescu, discussa presso l'Universit`adegli Studi di Udine To my parents Tesi di dottorato di Alexandru Ioan Tomescu, discussa presso l'Universit`adegli Studi di Udine Tesi di dottorato di Alexandru Ioan Tomescu, discussa presso l'Universit`adegli Studi di Udine Abstract In set theory and formal logic, a set is generally an object containing nothing but other sets as elements. Not only sets enable uniformity in the formalization of the whole of mathematics, but their ease-of-use and conciseness are employed to represent information in some computer languages. Given the intrinsic nesting property of sets, it is natural to represent them as directed graphs: vertices will stand for sets, while the arc relation will mimic the membership relation. This switch of perspective is important: from a computational point of view, this led to many decidability results, while from a logical point of view, this allowed for natural extensions of the concept of set, such as that of hyperset. Interpreting a set as a directed graph gives rise to many combinatorial, structural and computational questions, having as unifying goal that of a transfer of results and techniques across the two areas. -
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University of Warwick institutional repository: http://go.warwick.ac.uk/wrap A Thesis Submitted for the Degree of PhD at the University of Warwick http://go.warwick.ac.uk/wrap/46969 This thesis is made available online and is protected by original copyright. Please scroll down to view the document itself. Please refer to the repository record for this item for information to help you to cite it. Our policy information is available from the repository home page. Supporting the Migration from Construal to Program: Rethinking Software Development by Nicolas William Pope Thesis Submitted to the University of Warwick for the degree of Doctor of Philosophy Department of Computer Science August 2011 Contents List of Tables vii List of Figures viii Acknowledgments xvi Declarations xvii Abstract xviii Abbreviations xix Chapter 1 Introduction 1 1.1 Plastic Applications . .1 1.2 Plastic Software Environments . .4 1.3 A Lack of Plasticity . .6 1.4 Thesis Aims . .9 1.5 Thesis Outline . 10 Chapter 2 Background 13 2.1 End-User Development . 13 2.1.1 Principles . 14 2.1.2 Common Approaches . 17 ii 2.1.3 Existing Environments . 17 2.1.4 Guidelines . 24 2.2 Empirical Modelling . 26 2.2.1 What is Empirical Modelling? . 26 2.2.2 The Principles . 32 2.2.3 Current Tools . 35 2.2.4 An Example Model . 38 2.2.5 EM and Software Development . 41 2.3 Miscellaneous Technologies . 43 Chapter 3 Enabling Plastic Applications 45 3.1 Empirical Modelling and Plastic Applications . 45 3.2 Dimensions of Refinement . 48 3.3 Limitations of EM Tools and Concepts . -
Philosophy at Cambridge Newsletter of the Faculty of Philosophy Issue 10 May 2013
Philosophy at Cambridge Newsletter of the Faculty of Philosophy Issue 10 May 2013 ISSN 2046-9632 From the Chair Tim Crane is to be able to fully fund all our graduate students, MPhil and PhD. The campaign has been initiated by some very generous donations from our alumni, and a brochure, Thinking Through the 21st Century: The Next Generation of Cambridge Philosophers has been produced by the University’s Development Office. For a copy of this brochure, please contact the Development Office: www.campaign.cam.ac.uk. For other inquiries about this campaign, please feel free to contact me directly. The second exciting recent development—and our major news for this year—is that we have appointed Richard Holton and Rae Langton from the Massachusetts Institute of Technology to professorships in the Faculty, starting in September this year. They are both world- leading philosophers who have made substantial contributions to a number of Professors Rae Langton and Richard Holton to join the Faculty different areas of the subject. Richard works especially on the Welcome to the tenth Faculty of Philosophy the researchers of the future, they are the philosophy of mind and its connections Newsletter. Charles de Gaulle is supposed researchers of the present. with psychology and moral philosophy, to have said that if you want things to But it has become increasingly difficult including decision-making, making stay the same, you have to perpetually in recent years for graduate students up your mind, weakness of the will renew them; and in the Faculty of in philosophy to fund their education. -
An Anthology of Philosophical Studies Volume 9
AN ANTHOLOGY OF PHILOSOPHICAL STUDIES VOLUME 9 Editor Patricia Hanna University of Utah USA Editorial Board Maria Adamos Georgia Southern University USA Gary Fuller Central Michigan University USA Donald Poochigian University of North Dakota USA Andrew Ward University of York UK Joe Naimo University of Notre Dame Australia Australia Board of Reviewers Daniel Considine Metropolitan State College in Denver, Colorado USA. Katherine Cooklin Slippery Rock University of Pennsylvania USA Chrysoula Gitsoulis City College of New York USA Keith Green East Tennessee State University USA Dimitria Electra Gratzia University of Akron USA Philip Matthews University of Notre Dame Australia Australia Michael Matthis Lamar University USA Mark McEvoy Hofstra University USA Chris Onof Birkbeck College UK John Thompson Christopher Newport University USA Kiriake Xerohemona Florida International University USA AN ANTHOLOGY OF PHILOSOPHICAL STUDIES VOLUME 9 Edited by Patricia Hanna Athens Institute for Education and Research 2015 AN ANTHOLOGY OF PHILOSOPHICAL STUDIES VOLUME 9 First Published in Athens, Greece by the Athens Institute for Education and Research. ISBN: 978-618-5065-95-9 All rights reserved. No part of this publication may be reproduced, stored, retrieved system, or transmitted, in any form or by any means, without the written permission of the publisher, nor ne otherwise circulated in any form of binding or cover. Printed and bound in Athens, Greece by ATINER 8 Valaoritou Street, Kolonaki 10671 Athens, Greece www.atiner.gr ©Copyright 2015 by the Athens Institute for Education and Research. The individual essays remain the intellectual properties of the contributors. Table of Contents 1. Introduction 1 Patricia Hanna 2. Epicurean Pleasure 3 Andrew Alwood 3. -
54 Michael Cina Ramsey Is Stout and Warm, Rectangular with Rounded
Ramsey Type Family Styles 54 Designer Michael Cina About Ramsey is stout and warm, rectangular with rounded edges, and dynamic with swift cuts. Ranging from thin and condensed to extended and black, Ramsey has seen applications in sports teams to movie titles and even art magazines. Through the years, Ramsey has proven itself to be a true workhorse of a font. This version has a lot of minor updates to the form and spacing, and we now see an ex- tended family to complete it’s legacy. Query © Public Type 2020 www.publictype.us 1 Styles Ramsey Condensed - Thin Ramsey Condensed - Thin Italic Ramsey Condensed - ExtraLight Ramsey Condensed - ExtraLight Italic Ramsey Condensed - Light Ramsey Condensed - Light Italic Ramsey Condensed - Regular Ramsey Condensed - Regular Italic Ramsey Condensed - Medium Ramsey Condensed - Medium Italic Ramsey Condensed - SemiBold Ramsey Condensed - SemiBold Italic Ramsey Condensed - Bold Ramsey Condensed - Bold Italic Ramsey Condensed - ExtraBold Ramsey Condensed - ExtraBold Italic Ramsey Condensed - Black Ramsey Condensed - Black Italic Ramsey - Thin Ramsey - Thin Italic Ramsey - ExtraLight Ramsey - ExtraLight Italic Ramsey - Light Ramsey - Light Italic Ramsey - Regular Ramsey - Regular Italic Ramsey - Medium Ramsey - Medium Italic Ramsey - SemiBold Ramsey - SemiBold Italic Ramsey - Bold Ramsey - Bold Italic Ramsey - ExtraBold Ramsey - ExtraBold Italic Ramsey - Black Ramsey - Black Italic Ramsey Extended - Thin Ramsey Extended - Thin Italic Ramsey Extended - ExtraLight Ramsey Extended - ExtraLight Italic Ramsey -
Proving Gödel's Completeness and Incompleteness Theorems
IARJSET ISSN (Online) 2393-8021 ISSN (Print) 2394-1588 International Advanced Research Journal in Science, Engineering and Technology Vol. 8, Issue 1, January 2021 DOI: 10.17148/IARJSET.2021.8109 Proving Gödel’s Completeness and Incompleteness Theorems (in restricted cases) using Sd - Topology over the theory of a Model Soham Dasgupta (Ex. PGT (Math) at Kendriya Vidyalaya Ordnance Factory, Dumdum, Kolkata, W.B , INDIA) Type: Research article ( Sub: Pure Mathematics) AMS -MSC2010 No. 03B99 Abstract: This is a modification as well as a model theoretic application of my previous paper Sd- Topology over the theory of a Model. The main intention of this article is to proof and visualize the celebrated Gödel’s completeness and incompleteness theorems in a different and lucid approach. Keywords: Theory, Theorem, Proof, Kuratowski’s Closer Operator, Topology, Sd-Topology, Gödel’s completeness and incompleteness theorems. INTRODUCTION This is a continuation and application of Sd-Topology over the theory of a Model (DOI: 10.17148/IARJSET.2020.71201) to provide a lucid and short proof of the famous Gödel’s completeness and incompleteness theorems. Here as we are using Sd Topology so the conditions will be restricted as the cardinality of the universe of the working model should be card 퓤 ≥ℵ0 and also the cardinality of the working theory should be card(Th 퓤)≥ card (퓤 ). The inspiration of this article also have a very deep connection with philosophy. The similar statements of the Gödel's incompleteness theorems have also been mentioned in the ancient Rigveda's 10/129th mandala as following, नासदासीन्नो सदासीत्तदानीीं नासीद्रजो नो व्योमा परो यत् | किमावरीवः िुह िस्य शममन्नम्भः किमासीद्गहनीं गभीरम् ॥ १॥ िो अद्धा वेद ि इह प्र वोचत्कुत आजाता िुत इयीं कवसृकटः | अवामग्देवा अस्य कवसजमनेनाथा िो वेद यत आबभूव ॥६॥ इयीं कवसृकटयमत आबभूव यकद वा दधे यकद वा न | यो अस्याध्यक्षः परमे व्योमन्त्सो अङ्ग वेद यकद वा न वेद ॥७॥ The meaning of these Slokas are: 1. -
Foundations of Applied Mathematics I
Foundations of Applied Mathematics I Jeffrey Ketland University of Warsaw [email protected] Forthcoming in Synthese November 23, 2020 Abstract This paper aims to study the foundations of applied mathematics, using a for- malized base theory for applied mathematics: ZFCAσ (Zermelo-Fraenkel set theory (with Choice) with atoms, where the subscript used refers to a signature specific to the application. Examples are given, illustrating the following five features of applied mathematics: comprehension principles, application conditionals, represen- tation hypotheses, transfer principles and abstract equivalents. Contents 1 Mathematicized Theories2 2 How The Laws of Set Theory Apply8 3 A Base Theory for Applied Mathematics9 4 Comprehension and Set Abstracts 17 5 Abstract Counterparts: Equivalence Modulo Mathematics 20 6 Systems and Equivalences 21 7 Application Conditionals 30 8 Representation and Transfer 34 9 Summary 37 A Four-Sorted System 38 1 1 Mathematicized Theories Standard scientific theory supplies much of the information it supplies about physical entities only indirectly, by way of apparatus pertaining to supposed relationships of physical entities to supposed mathematical entities and sup- posed classifications of and relationships among the supposed mathematical entities themselves. As much of what science says about observable entities is “theory-laden”, so much of what science says about concrete entities (observable or theoretical) is “abstraction-laden”. (Burgess & Rosen(1997): 84) 1.1 The Logical Structure of Applied Mathematics This paper aims to study the foundations of applied mathematics. Perhaps contrary to current fashions, I treat applied mathematics as taking place within a certain formalized system: specifically, Zermelo-Fraenkel set theory (with Choice) with atoms, over an application signature σ.