Dear readers:

Welcome to this update to my book
Alan Turing: the Enigma
made possible by Alan Turing's invention, the computer.

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Alan Turing: the Enigma

You are on the Book Update section of my large Alan Turing website. This Book Update takes the role of a new preface to the book, and a guide to developments since its first edition in 1983.

This Update is incomplete and is always under development.

I thank the many readers of my book whose messages have helped me to build up this material.

The Update is divided into parts which correspond in the obvious way to the parts of the book:

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Andrew Hodges