A Logical Journey

A Logical Journey

From Gödel to Philosophy

By Hao Wang

A Bradford Book





Hao Wang (1921-1995) was one of the few confidants of the great mathematician and logician Kurt Gödel. A Logical Journey is a continuation of Wang's Reflections on Gödel and also elaborates on discussions contained in From Mathematics to Philosophy. A decade in preparation, it contains important and unfamiliar insights into Gödel's views on a wide range of issues, from Platonism and the nature of logic, to minds and machines, the existence of God, and positivism and phenomenology.

The impact of Gödel's theorem on twentieth-century thought is on par with that of Einstein's theory of relativity, Heisenberg's uncertainty principle, or Keynesian economics. These previously unpublished intimate and informal conversations, however, bring to light and amplify Gödel's other major contributions to logic and philosophy. They reveal that there is much more in Gödel's philosophy of mathematics than is commonly believed, and more in his philosophy than his philosophy of mathematics.

Wang writes that "it is even possible that his quite informal and loosely structured conversations with me, which I am freely using in this book, will turn out to be the fullest existing expression of the diverse components of his inadequately articulated general philosophy."

The first two chapters are devoted to Gödel's life and mental development. In the chapters that follow, Wang illustrates the quest for overarching solutions and grand unifications of knowledge and action in Gödel's written speculations on God and an afterlife. He gives the background and a chronological summary of the conversations, considers Gödel's comments on philosophies and philosophers (his support of Husserl's phenomenology and his digressions on Kant and Wittgenstein), and his attempt to demonstrate the superiority of the mind's power over brains and machines. Three chapters are tied together by what Wang perceives to be Gödel's governing ideal of philosophy: an exact theory in which mathematics and Newtonian physics serve as a model for philosophy or metaphysics. Finally, in an epilog Wang sketches his own approach to philosophy in contrast to his interpretation of Gödel's outlook.


Out of Print ISBN: 9780262231893 408 pp. | 6 in x 9 in


$35.00 X ISBN: 9780262529167 408 pp. | 6 in x 9 in


  • The great logician Kurt Godel devoted many years of his life to philosophy but published little not directly related to his technical work. The late Hao Wang's reconstruction of his remarkable conversations with Godel records Wang's encounter with and reflection on a very distinctive view of the world, at odds with the spirit of the time. The conversations also fill out many of the cryptic remarks in godel's published philosophical writings. This book will be indispensable for anyone wanting to understand Godels philosophical thoughts.

    Charles Parsons

    Edgar Pierce Professor of Philosophy, Harvard University

  • In his later years Godel chose to express to Hao Wang various aspects of his unpublished philosophical views, with the understanding that they would someday be published in the form, in some sense, of 'discussions.' The result is a remarkable book which contains important and unfamiliar insights into Godel's views on a wide range of issues, from mind vs. machine, concept vs. set, and truth vs. proof, to marriage, religion and the 'afterlife,' and politics.

    Palle Yourgrau

    Author of The Disappearance of Time: Kurt Godel and the Idealistic Tradition in Philosophy

  • Experts in mathematical logic will find this book of engrossing interest. For mere philosphers it will have a different fascination: in seeing how the achievements of a genius can seem to him to provide a firm foundation for a species of Platonism and the conviction of the superiority of minds over computers, and at the same time can encourage him to favour a quasi-Leibnizian speculative metaphysics and theology. Hao Wang records and assesses the whole with an expert and balanced reasonableness.

    Sir Peter F. Strawson

    Magdalen College, Oxford