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higher-order logic - University of Amsterdam
higher-order logic - University of Amsterdam

... etcetera, referring to specific finite quantities. What is lacking, however, is the general mathematical concept of finiteness. EXAMPLE. The notion ‘finiteness of the domain’ is not definable by means of any first-order sentence, or set of such sentences. It will be recalled that the relevant refuta ...
Discrete Mathematics: Chapter 2, Predicate Logic
Discrete Mathematics: Chapter 2, Predicate Logic

... for deductive argumentation. It is always important to strive to construct a complete Deduction System; otherwise we will not have a sufficiently powerful arsenal of proof techniques at our disposal. Having attained this, though, we should remember that a Deduction System’s completeness is always sy ...
Discrete Mathematics
Discrete Mathematics

... This can be expressed in predicate logic as: − “For all situations s, if p is true in situation s, then q is also true in situation s” − Formally, we could write: ∀s, P(s) → Q(s) This sentence is logically False in our example, because for me to wear a red shirt and the U.S. not to attack Iraq is a ...
On the Notion of Coherence in Fuzzy Answer Set Semantics
On the Notion of Coherence in Fuzzy Answer Set Semantics

... negation in the context of residuated logic programming is provided in terms of the notion of coherence as a generalization in the fuzzy framework of the concept of consistence. Then, fuzzy answer sets for general residuated logic programs are defined as a suitable generalization of the Gelfond-Lifs ...
Introduction to Logic
Introduction to Logic

Contents 1 The Natural Numbers
Contents 1 The Natural Numbers

Version 1.5 - Trent University
Version 1.5 - Trent University

... and determine their truth. The real fun lies in the relationship between interpretation of statements, truth, and reasoning. This volume develops the basics of two kinds of formal logical systems, propositional logic and first-order logic. Propositional logic attempts to make precise the relationshi ...
Section 1: Propositional Logic
Section 1: Propositional Logic

... with function forms in other areas of mathematics but just their values. That is a misconception. We are concerned with function forms in algebra. It’s just that you’re so used to the equality of different forms that you’ve forgotten that. Knowing that certain forms represent the same function allow ...
Propositional Proof Complexity An Introduction
Propositional Proof Complexity An Introduction

... There is related notion of implicational completeness: Write φ |= ψ if for every truth assignment ~a to variables occurring in φ and/or ψ , ~a |= φ ⇒ ~a |= ψ . Write φ ` ψ if adding φ as an axiom would allow one to construct a proof of ψ . (Note that neither φ or ψ need be valid by themselves.) Then ...
A Well-Founded Semantics for Logic Programs with Abstract
A Well-Founded Semantics for Logic Programs with Abstract

... While ASP assumes that solutions are given by answer sets, well-founded models (Van Gelder, Ross, and Schlipf 1991) have been found to be very useful as well. First, computing the well-founded model of a normal logic program is tractable. This compares to the NP-completeness of computing an answer s ...
Introduction to Logic
Introduction to Logic

An Interpolating Theorem Prover
An Interpolating Theorem Prover

Hybrid, Classical, and Presuppositional Inquisitive Semantics
Hybrid, Classical, and Presuppositional Inquisitive Semantics

Belief Revision in non
Belief Revision in non

Ans - Logic Matters
Ans - Logic Matters

... (a) Define the terms of L. (b) Show that it is algorithmically decidable which expressions are L-terms. (c) Define the atomic wffs of L. (d) Show that it is algorithmically decidable which expressions are atomic L-wffs. (e) Define the wffs of L [allowing wffs with free variables]. (f) Show that it i ...
arXiv:1410.5037v2 [cs.LO] 18 Jun 2016
arXiv:1410.5037v2 [cs.LO] 18 Jun 2016

Revisiting Preferences and Argumentation
Revisiting Preferences and Argumentation

Cut-elimination for provability logics and some results in display logic
Cut-elimination for provability logics and some results in display logic

... the contraction rule that are hidden in such calculi. Recently it has been claimed that the cut-elimination procedure does not terminate when applied to the corresponding sequent calculus built from multisets. Here we show how to resolve this issue in order to obtain a syntactic proof of cut-elimina ...
Informal Proceedings of the 30th International Workshop on
Informal Proceedings of the 30th International Workshop on

3.6 First-Order Tableau
3.6 First-Order Tableau

Reasoning about Action and Change
Reasoning about Action and Change

... pin, that there is no magnet present which distracts the bullet, and so on. But if our formalization takes everything into account that could block the performance of an action, it will be without practical use. In nonmonotonic logics, both the extended prediction problem and the qualification probl ...
Modal Consequence Relations
Modal Consequence Relations

Propositional inquisitive logic: a survey
Propositional inquisitive logic: a survey

... Alice and Bob live in the same city, any given piece of information on Alice’s city of residence yields some corresponding information on Bob’s city of residence. We may say that what is at play in (2) are two types of information, which we may see as labeled by the questions where Alice lives and w ...
Relevant and Substructural Logics
Relevant and Substructural Logics

page 139 EROTETIC SEARCH SCENARIOS, PROBLEM
page 139 EROTETIC SEARCH SCENARIOS, PROBLEM

... in which questions are addressed to a source of information. The choice is a matter of strategy. The only restriction imposed on questions that may occur in interrogative moves is that the presuppositions of these questions have to be established, i.e. must be conclusions of some earlier deductive m ...
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Natural deduction

In logic and proof theory, natural deduction is a kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the ""natural"" way of reasoning. This contrasts with the axiomatic systems which instead use axioms as much as possible to express the logical laws of deductive reasoning.
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