Preface to Second Edition

Alan Turing was born on June 23, 1912. The year 2012, the hundredth anniversary of his birth, is providing the occasion for events and publications reflecting on and celebrating his achievements. I am delighted that this updated version of my book will be part of the excitement, and I am very grateful to Klaus Peters and Alice Peters for their help in making it happen. For this edition, I’ve tidied up some loose ends and brought a few things up to date, even commenting on IBM’s achievement in fielding its Watson computer as a successful contestant on the popular television quiz program Jeopardy.

The “universality” of the computers with which we interact today is evident in the myriad unrelated tasks for which the computers ...

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