Higher Recursion Theory

Author: Gerald E. Sacks
Publisher: Cambridge University Press
ISBN: 1316739465
Category: Mathematics
Page: N.A
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Since their inception, the Perspectives in Logic and Lecture Notes in Logic series have published seminal works by leading logicians. Many of the original books in the series have been unavailable for years, but they are now in print once again. This volume, the second publication in the Perspectives in Logic series, is an almost self-contained introduction to higher recursion theory, in which the reader is only assumed to know the basics of classical recursion theory. The book is divided into four parts: hyperarithmetic sets, metarecursion, α-recursion, and E-recursion. This text is essential reading for all researchers in the field.

Bounded Queries in Recursion Theory

Author: William Levine,Georgia Martin
Publisher: Springer Science & Business Media
ISBN: 1461206359
Category: Computers
Page: 353
View: 5375

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One of the major concerns of theoretical computer science is the classifi cation of problems in terms of how hard they are. The natural measure of difficulty of a function is the amount of time needed to compute it (as a function of the length of the input). Other resources, such as space, have also been considered. In recursion theory, by contrast, a function is considered to be easy to compute if there exists some algorithm that computes it. We wish to classify functions that are hard, i.e., not computable, in a quantitative way. We cannot use time or space, since the functions are not even computable. We cannot use Turing degree, since this notion is not quantitative. Hence we need a new notion of complexity-much like time or spac~that is quantitative and yet in some way captures the level of difficulty (such as the Turing degree) of a function.

Recursion Theory

Computational Aspects of Definability
Author: Chi Tat Chong,Liang Yu
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110275643
Category: Mathematics
Page: 320
View: 3907

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This monograph presents recursion theory from a generalized and largely global point of view. A major theme is the study of the structures of degrees arising from two key notions of reducibility, the Turing degrees and the hyperdegrees, using ideas and techniques beyond those of classical recursion theory. These include structure theory, hyperarithmetic determinacy and rigidity, basis theorems, independence results on Turing degrees, as well as applications to higher randomness.

The Role of True Finiteness in the Admissible Recursively Enumerable Degrees

Author: Noam Greenberg
Publisher: American Mathematical Soc.
ISBN: 0821838857
Category: Mathematics
Page: 99
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When attempting to generalize recursion theory to admissible ordinals, it may seem as if all classical priority constructions can be lifted to any admissible ordinal satisfying a sufficiently strong fragment of the replacement scheme. We show, however, that this is not always the case. In fact, there are some constructions which make an essential use of the notion of finiteness which cannot be replaced by the generalized notion of $\alpha$-finiteness. As examples we discuss both codings of models of arithmetic into the recursively enumerable degrees, and non-distributive lattice embeddings into these degrees.We show that if an admissible ordinal $\alpha$ is effectively close to $\omega$ (where this closeness can be measured by size or by confinality) then such constructions may be performed in the $\alpha$-r.e. degrees, but otherwise they fail. The results of these constructions can be expressed in the first-order language of partially ordered sets, and so these results also show that there are natural elementary differences between the structures of $\alpha$-r.e. degrees for various classes of admissible ordinals $\alpha$. Together with coding work which shows that for some $\alpha$, the theory of the $\alpha$-r.e. degrees is complicated, we get that for every admissible ordinal $\alpha$, the $\alpha$-r.e. degrees and the classical r.e. degrees are not elementarily equivalent.

General Recursion Theory

Author: Jens E. Fenstad
Publisher: Cambridge University Press
ISBN: 1107168163
Category: Mathematics
Page: 237
View: 5125

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Since their inception, the Perspectives in Logic and Lecture Notes in Logic series have published seminal works by leading logicians. Many of the original books in the series have been unavailable for years, but they are now in print once again. In this volume, the tenth publication in the Perspectives in Logic series, Jens E. Fenstad takes an axiomatic approach to present a unified and coherent account of the many and various parts of general recursion theory. The main core of the book gives an account of the general theory of computations. The author then moves on to show how computation theories connect with and unify other parts of general recursion theory. Some mathematical maturity is required of the reader, who is assumed to have some acquaintance with recursion theory. This book is ideal for a second course in the subject.

Fundamentals of Mathematical Logic

Author: Peter G. Hinman
Publisher: A K Peters/CRC Press
ISBN: 9781568812625
Category: Mathematics
Page: 896
View: 6557

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This introductory graduate text covers modern mathematical logic from propositional, first-order and infinitary logic and Gödel's Incompleteness Theorems to extensive introductions to set theory, model theory and recursion (computability) theory. Based on the author's more than 35 years of teaching experience, the book develops students' intuition by presenting complex ideas in the simplest context for which they make sense. The book is appropriate for use as a classroom text, for self-study, and as a reference on the state of modern logic.


Author: Vanderbilt University
Publisher: N.A
ISBN: 9780897918916
Category: Machine learning
Page: 338
View: 1964

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Books in Print

Author: N.A
Publisher: N.A
Category: American literature
Page: N.A
View: 3066

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Books in print is the major source of information on books currently published and in print in the United States. The database provides the record of forthcoming books, books in-print, and books out-of-print.

Constructivity and Computability in Historical and Philosophical Perspective

Author: Jacques Dubucs,Michel Bourdeau
Publisher: Springer
ISBN: 9401792178
Category: Philosophy
Page: 214
View: 1978

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Ranging from Alan Turing’s seminal 1936 paper to the latest work on Kolmogorov complexity and linear logic, this comprehensive new work clarifies the relationship between computability on the one hand and constructivity on the other. The authors argue that even though constructivists have largely shed Brouwer’s solipsistic attitude to logic, there remain points of disagreement to this day. Focusing on the growing pains computability experienced as it was forced to address the demands of rapidly expanding applications, the content maps the developments following Turing’s ground-breaking linkage of computation and the machine, the resulting birth of complexity theory, the innovations of Kolmogorov complexity and resolving the dissonances between proof theoretical semantics and canonical proof feasibility. Finally, it explores one of the most fundamental questions concerning the interface between constructivity and computability: whether the theory of recursive functions is needed for a rigorous development of constructive mathematics. This volume contributes to the unity of science by overcoming disunities rather than offering an overarching framework. It posits that computability’s adoption of a classical, ontological point of view kept these imperatives separated. In studying the relationship between the two, it is a vital step forward in overcoming the disagreements and misunderstandings which stand in the way of a unifying view of logic.

Rekursive Funktionen

Author: Heinz Lüneburg
Publisher: Springer-Verlag
ISBN: 364255993X
Category: Mathematics
Page: 86
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Dieses Buch basiert auf Vorlesungen, die der Autor in Kaiserslautern gehalten hat. Ihr wesentliches Anliegen war, die Turing-berechenbaren Wortfunktionen auf eine von jeglichem Maschinenmodell unabhängige Weise zu charakterisieren, nämlich als die partiell Wort-rekursiven Wortfunktionen. Wortfunktionen lassen sich mittels arithmetischer Funktionen darstellen und zwar so, dass die partiell rekursiven arithmetischen Funktionen den partiell Wort-rekursiven Wortfunktionen entsprechen, was für sich gesehen schon nicht auf der Hand liegt. Auf diese Weise erhält man den Begriff der Turing-Berechenbarkeit auch für arithmetische Funktionen. Der Satz also, dass die Turing-berechenbaren Wortfunktionen gerade die partiell rekursiven Wortfunktionen sind, ist überhaupt nicht selbstverständlich, so dass auf dem Wege zu diesem Satz eine ganze Reihe hoch interessanter weiterer Sätze zu beweisen sind. Dies alles ist hier aufgeschrieben.

Logic Colloquium 2000

proceedings of the Annual European Summer Meeting of the Association for Symbolic Logic, held in Paris, France, July 23-31, 2000
Author: René Cori
Publisher: A K Peters Ltd
Category: Mathematics
Page: 408
View: 4828

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This compilation of papers presented at the 2000 European Summer Meeting of the Association for Symbolic Logic marks the centenial anniversery of Hilbert's famous lecture. Held in the same hall at La Sorbonne where Hilbert first presented his famous problems, this meeting carries special significance to the Mathematics and Logic communities. The presentations include tutorials and research articles from some of the world's preeminent logicians. Three long articles are based on tutorials given at the meeting, and present accessible expositions of devloping research in three active areas of logic: model theory, computability, and set theory. The eleven subsequent articles cover seperate research topics in all areas of mathematical logic, including: aspects in Computer Science, Proof Theory, Set Theory, Model Theory, Computability Theory, and aspects of Philosophy.

Perspectives on the History of Mathematical Logic

Author: Thomas Drucker
Publisher: Springer Science & Business Media
ISBN: 0817647694
Category: Mathematics
Page: 195
View: 1120

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This volume offers insights into the development of mathematical logic over the last century. Arising from a special session of the history of logic at an American Mathematical Society meeting, the chapters explore technical innovations, the philosophical consequences of work during the period, and the historical and social context in which the logicians worked. The discussions herein will appeal to mathematical logicians and historians of mathematics, as well as philosophers and historians of science.

Recursively Enumerable Sets and Degrees

A Study of Computable Functions and Computably Generated Sets
Author: Robert I. Soare
Publisher: Springer Science & Business Media
ISBN: 9783540152996
Category: Mathematics
Page: 437
View: 9703

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..."The book, written by one of the main researchers on the field, gives a complete account of the theory of r.e. degrees. .... The definitions, results and proofs are always clearly motivated and explained before the formal presentation; the proofs are described with remarkable clarity and conciseness. The book is highly recommended to everyone interested in logic. It also provides a useful background to computer scientists, in particular to theoretical computer scientists." Acta Scientiarum Mathematicarum, Ungarn 1988 ..."The main purpose of this book is to introduce the reader to the main results and to the intricacies of the current theory for the recurseively enumerable sets and degrees. The author has managed to give a coherent exposition of a rather complex and messy area of logic, and with this book degree-theory is far more accessible to students and logicians in other fields than it used to be." Zentralblatt für Mathematik, 623.1988