Dear readers:Welcome to this update to my book
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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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