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Norms and Logic

An Investigation of the Links Between Normontology and Deontic Logic, Especially in the Work of G.H. Von Wright

Legal Reasoning . Die juristische Argumentation ( Actes du Congrès Mondial de philosophie du droit et philosophie sociale ) , Bruxelles , 1971 , pp . 404-419 . 1487 Wróblewski , Jerzy , ' Systems of Norms and Legal Systems ' ...

Logic and Argumentation

Proceedings of the Colloquium, 'Logic and Argumentation', Amsterdam, 14-17 June 1994

Paperback. This volume finds its origin in a colloquium on Logic and Argumentation, held in June 1994 in Amsterdam and sponsored by the Royal Netherlands Academy of Arts and Sciences. The papers included have been selected for the role they can play in illuminating current thinking about the various kinds of relations between logic and argumentation.Aiming to provide some background to the academic endeavour of exploring the connections between logic and argumentation this volume offers the reader some representative specimina of current thinking about this subject.

Non - monotonic Reasoning . Logical foundations of Common - sense . ... Amsterdam : Compute - Law Institute VU , pp . 10-20 . ... A dialogical model of legal reasoning ' . In : C. Gruetters e.a. ( eds . ) . Legal Knowledge Based Systems ...

Symbolic Logic and Other Forms of Deductive Reasoning

This text does not presuppose any technical background in math or logic. The first seven chapters cover all the basic components of a first course in symbolic logic, including truth tables, rules for devising formal proofs of validity, multiple quantifiers, properties of relations, enthymemes, and identity. (One exception is that truth trees are not discussed.) The five operator symbols used are: (.) and, (v) or, ( ) not, and also if-then, represented by the sideways U and material equivalence represented by the triple line. There are also four chapters which can be studied without symbolic logic background. Chapter 8 is a study of 7 immediate inferences in Aristotelian logic using A, E, I, O type statements with a detailed proof concerning what existential assumptions are involved. Chapter 9 is a study of classic Boolean syllogism using Venn diagrams to show the validity or invalidity of syllogisms. Chapter 10 is a study of the type of probability problems that are deductive (example: having 2 aces in 5 cards drawn from a randomized deck of cards). Chapter 11 is a study of the types of problems that are often found on standardized tests where certain data are given, and then multiple-choice questions are given where the single correct answer is determined by the data. In the symbolic logic chapters, it is shown many times how putting English statements into symbolic notation reveals the complexity (and sometimes ambiguity) of natural language. Many examples are given of the usage of logic in everyday life, with statements to translate taken from musicals, legal documents, federal tax instructions, etc. Several sections involve arguments given in English, which must be translated into symbolic notation before proof of validity is given. Chapter 7 ends with a careful presentation of Richard's Paradox, challenging those who dismiss the problem because it is not strictly mathematical. The conclusion of this chapter is the most controversial part of the text. Richard's paradox is used to construct a valid symbolic logic proof that Cantor's procedure does not prove there are nondenumerable sets, with a challenge to the reader to identify and prove which premise of the argument is false. There are several uncommon features of the text. For example, there is a section where it is shown how the rules of logic are used in solving Sudoku puzzles. Another section challenges students to devise arguments (premises and conclusion) that can be solved in a certain number of steps (say 3) only by using a certain 3 rules, one time each (for example, Modus Ponens, Simplification, and Conjunction). In proofs of invalidity, if there are 10 simple statements (for example), there are 1024 possible combinations of truth values that the 10 statements can have. But the premises and conclusions are set up so that only 1 of these combinations will make all the premises true and the conclusion false - and this 1 way can be found by forced truth-value assignments, with no need to take options. Another unusual section of the text defines the five operator symbols as relations (for example, Cxy = x conjuncted with y is true), and then statements about the operators are given to determine whether the statements are true or false. To aid in deciding what sections to cover in a given course or time frame, certain sections are labeled "optional" as an indication that understanding these sections is not presupposed by later sections in the text. Although there are a ton of problems with answers in the text, any teacher using this text for a course can receive free of charge an answer book giving answers to all the problems not answered in the text, plus a few cases of additional problems not given in the text, also with answers. Send your request to [email protected], and you will be sent an answer key using your address at the school where you teach.

This text does not presuppose any technical background in math or logic.

Errors of Reasoning. Naturalizing the Logic of Inference

Errors of Reasoning is the long-awaited continuation of the author's investigation of the logic of cognitive systems. The present focus is the individual human reasoner operating under the conditions and pressures of real life with capacities and resources the natural world makes available to him. The ensuing logic is thus agent-centred, goal-directed, and time-and-action oriented. It is also as psychologically real a logic as consistent with lawlike regularities of the better-developed empirical sciences of cognition. A point of departure for the book is that good reasoning is typically reasoning that does not meet the orthodox logician's requirements of either deductive validity or the sort of inductive strength sought for by the statistico-empirical sciences. A central objective here is to fashion a logic for this "third-way" reasoning. In so doing, substantial refinements are proposed for mainline treatments of nonmonotonic, defeasible, autoepistemic and default reasoning. A further departure from orthodox orientations is the eschewal of all idealizations short of those required for the descriptive adequacy of the relevant parts of empirical science. Also banned is any unearned assumption of a logic's normative authority to judge inferential behaviour as it actually occurs on the ground. The logic that emerges is therefore a naturalized logic, a proposed transformation of orthodox logics in the manner of the naturalization, more than forty years ago, of the traditional approaches to analytic epistemology. A byproduct of the transformation is the abandonment of justification as a general condition of knowledge, especially in third-way contexts. A test case for this new approach is an account of erroneous reasoning, including inferences usually judged fallacious, that outperforms its rivals in theoretical depth and empirical sensitivity. Errors of Reasoning is required reading in all research communities that seek a realistic understanding of human inference: Logic, formal and informal, AI and the other branches of cognitive science, argumentation theory, and theories of legal reasoning. Indeed the book is a standing challenge to all normatively idealized theories of assessable human performance. John Woods is Director of The Abductive Systems Group at the University of British Columbia, and was formerly the Charles S. Peirce Professor of Logic in the Group on Logic and Computation in the Department of Computer Science, King's College London. He is author of Paradox and Paraconsistency (2003) and with Dov Gabbay, of Agenda Relevance (2003) and The Reach of Abduction (2005). His pathbreaking The Logic of Fiction appeared in 1974, with a second edition by College Publications, 2009.

A central objective here is to fashion a logic for this "third-way" reasoning. In so doing, substantial refinements are proposed for mainline treatments of nonmonotonic, defeasible, autoepistemic and default reasoning.

Essays on Logic and Its Applications in Philosophy

This is a collection of essays about logic and its applications to various philosophical problems. In general, it is argued that logic constitutes an important device of philosophical analysis. Concerning the nature of logic the author defends the thesis that first-order logic is the logic. Among the philosophical problems to which logic is applied in the essays are: truth, consistency, realism, foundations of semantics, psychologism, undetermination of theories by empirical data, modalities, value concepts, identity, vagueness, God's existence, transcendentals, legal reasoning, category mistakes, bivalence, the cognitive relation, and meaningfulness.

This is a collection of essays about logic and its applications to various philosophical problems.

The Logic of Choice

An Investigation of the Concepts of Rule and Rationality

Originally published in 1968. This is a critical study of the concept of ‘rule’ featuring in law, ethics and much philosophical analysis which the author uses to investigate the concept of ‘rationality’. The author indicates in what manner the modes of reasoning involved in reliance upon rules are unique and in what fashion they provide an alternative both to the modes of logico-mathematical reasoning and to the modes of scientific reasoning. This prepares the groundwork for a methodology meeting the requirements of the fields using rules such as law and ethics which could be significant for communications theory and the use of computers in normative fields. Other substantive issues related to the mainstream of legal philosophy are discussed - theories of interpretation, the notion of purpose and the requirements of principled decision-making. The book utilizes examples drawn from English and American legal decisions to suggest how the positions of legal positivism and of natural law are equally artificial and misleading.

Originally published in 1968. This is a critical study of the concept of ‘rule’ featuring in law, ethics and much philosophical analysis which the author uses to investigate the concept of ‘rationality’.

Outlines of Modern Legal Logic

In legal reasoning formal consistency of thought is an end constantly pursued , even though it is not always achieved . To assure this consistency , ordinary common sense logic is employed , a logic expressed in an imprecise manner by ...

The Logic of Law Making in Islam

Women and Prayer in the Legal Tradition

This pioneering study examines the process of reasoning in Islamic law. Some of the key questions addressed here include whether sacred law operates differently from secular law, why laws change or stay the same and how different cultural and historical settings impact the development of legal rulings. In order to explore these questions, the author examines the decisions of thirty jurists from the largest legal tradition in Islam: the Hanafi school of law. He traces their rulings on the question of women and communal prayer across a very broad period of time - from the eighth to the eighteenth century - to demonstrate how jurists interpreted the law and reconciled their decisions with the scripture and the sayings of the Prophet. The result is a fascinating overview of how Islamic law has evolved and the thinking behind individual rulings.

This pioneering study examines the process of reasoning in Islamic law.