Kurt Gödel (1906 - 1978) was the most outstanding logician of the twentieth century, famous for his hallmark works on the completeness of logic, the incompleteness of number theory, and the consistency of the axiom of choice and the continuum hypothesis. He is also noted for his work on constructivity, the decision problem, and the foundations of computability theory, as well as for the strong individuality of his writings on the philosophy of mathematics. He is less well known for his discovery of unusual cosmological models for Einstein's equations, in theory permitting time travel into the past. The Collected Works is a landmark resource that draws together a lifetime of creative thought and accomplishment. The first two volumes were devoted to Gödel's publications in full (both in original and translation), and the third volume featured a wide selection of unpublished articles and lecture texts found in Gödel's Nachlass. These long-awaited final two volumes contain Gödel's correspondence of logical, philosophical, and scientific interest. Volume IV covers A to G, with H to Z in volume V; in addition, Volume V contains a full inventory of Gödel's Nachlass. All volumes include introductory notes that provide extensive explanatory and historical commentary on each body of work, English translations of material originally written in German (some transcribed from the Gabelsberger shorthand), and a complete bibliography of all works cited. Kurt Gödel: Collected Works is designed to be useful and accessible to as wide an audience as possible without sacrificing scientific or historical accuracy. The only comprehensive edition of Gödel's work available, it will be an essential part of the working library of professionals and students in logic, mathematics, philosophy, history of science, and computer science and all others who wish to be acquainted with one of the great minds of the twentieth century.

From reviews of Volume I: Anyone interested in the life and work of Kurt Gödel, or in the history of mathematical logic in this century, is indebted to all of the contributors to this volume for the care with which they have presented Gödel's work. They have succeeded in using their own expertise to elucidate both the nature and the significance of what Gödel and, in turn, mathematical logic have accomplished. * Isis From the example of this first volume, the edition promises to be a model of its kind; virtually nothing could be bettered.Mind *
These volumes contain, as well as the doctoral dissertation and a hitherto unpublished revision of a translation of the Dialectica paper, all of Gödel's work printed in his lifetime. The volumes are meticulously edited and are a pleasure to consult. Original page numbers are clearly shown; papers written in German are printed with facing translations. * R.O. Gandy, Bulletin of the London Mathematical Society, 24 (1992) *
This is the second volume of this impressive series of Gödel's works ... this second volume of his published works is really fundamental, as it was only in this period that Gödel decided to make public some traits of his philosophical position ... The introductory note to these writings, by R. Solovay, seems to me historically and technically superb. I congratulate the editorial team for including in this volume the improved 1972 version of the Dialectica paper of 1958 on finitary mathematics ... As a whole, the book is absolutely indispensable for anyone interested in Gödel's ideas, or generally on the history and philosophy of logic and mathematics. * Frqancisco A. Rodriguez-Consuegra, Universidad de Barcelona, Modern Logic, Volume 4, no. 3 (July 1994) *

The Editor-in-Chief Solomon Feferman is Professor of Mathematics and Philosophy, and Chairman of the Department of Mathematics at Stanford University. He is past president of the Association of Symbolic Logic. The Editors John W. Dawson, Jr., is Professor of Mathematics at Pennsylvania State University, York. Steven C. Kleene is Emeritus Dean of Letters and Science, and Emeritus Professor of Mathematics and Computer Science at the University of Wisconsin, Madison. Gregory H. Moore is Associate Professor of Mathematics at McMaster University, Hamilton, Ontario, Canada. Robert M. Solovay is Professor of Mathematics at the University of California, Berkeley. The late Jean van Heijenoort was Emeritus Professor of Philosophy at Brandeis University until his death in 1986.