About the book

Church's Thesis (CT) was first published by Alonzo Church in 1935. CT is a proposition that identifies two notions: an intuitive notion of a effectively computable function defined in natural numbers with the notion of a recursive function. Despite of the many efforts of prominent scientists, Church's Thesis has never been falsified. There exists a vast literature concerning the thesis. The aim of the book is to provide one volume summary of the state of research on Church's Thesis. These include the following:  different formulations of CT, CT and intuitionism, CT and intensional mathematics, CT and physics, the epistemic status of CT, CT and philosophy of mind, provability of CT and CT and functional programming.

 

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Darren Abramson

Church’s Thesis and Philosophy of Mind . . . . . . 9

Andreas Blass, Yuri Gurevich

Algorithms: A Quest for Absolute Definitions . . 24

Douglas S. Bridges

Church’s Thesis and Bishop’s Constructivism . . . 58

Selmer Bringsjord, Konstantine Arkoudas

On the Provability, Veracity, and AI-Relevance

of the Church–Turing Thesis . . . . . . . . . . . . . 66

Carol E. Cleland

The Church–Turing Thesis. A Last Vestige of

a Failed Mathematical Program . . . . . . . . . . . 119

B. Jack Copeland

Turing’s Thesis . . . . . . . . . . . . . . . . . . . . . . . 147

Hartmut Fitz

Church’s Thesis and Physical Computation . . . . . 175

Janet Folina

Church’s Thesis and the Variety of

Mathematical Justifications . . . . . . . . . . . . . . 220

Andrew Hodges

Did Church and Turing Have a Thesis about

Machines? . . . . . . . . . . . . . . . . . . . . . . . . . . 242

Leon Horsten

Formalizing Church’s Thesis . . . . . . . . . . . . . . 253

Stanis³aw Krajewski

Remarks on Church’s Thesis and G¨odel’s

Theorem . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

6 Contents

Charles McCarty

Thesis and Variations . . . . . . . . . . . . . . . . . . . 281

Elliott Mendelson

On the Impossibility of Proving the

“Hard-Half” of Church’s Thesis . . . . . . . . . . . 304

Roman Murawski, Jan Wolenski

The Status of Church’s Thesis . . . . . . . . . . . . . 310

Jerzy Mycka

Analog Computation and Church’s Thesis . . . . . 331

Piergiorgio Odifreddi

Kreisel’s Church . . . . . . . . . . . . . . . . . . . . . . 353

Adam Olszewski

Church’s Thesis as Formulated by Church —

An Interpretation . . . . . . . . . . . . . . . . . . . . . 383

Oron Shagrir

G¨odel on Turing on Computability . . . . . . . . . . 393

Stewart Shapiro

Computability, Proof, and Open-Texture . . . . . 420

Wilfried Sieg

Step by Recursive Step: Church’s Analysis of

Effective Calculability . . . . . . . . . . . . . . . . . 456

Karl Svozil

Physics and Metaphysics Look at Computation . . 491

David Turner

Church’s Thesis and Functional Programming . . 518

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545

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Adam Olszewski, Jan Wolenski, Robert Janusz. (eds.)

Church’s Thesis After 70 Years

Mathematical Logic Volume 1

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