## Alan Turing: The EnigmaA gripping story of mathematics, science, computing, war history, cryptography, and homosexual persecution and liberation. Hodges tells how Turing's revolutionary idea of 1936-- the concept of a universal machine-- laid the foundation for the modern computer. Turing brought the idea to practical realization in 1945 with his electronic design. This work was directly related to Turing's leading role in breaking the German Enigma ciphers during World War II, a scientific triumph that was critical to Allied victory in the Atlantic. Despite his wartime service, Turing was eventually arrested, stripped of his security clearance, and forced to undergo a humiliating treatment program-- all for trying to live honestly in a society that defined homosexuality as a crime. This New York Times bestselling biography of the founder of computer science and artificial intelligence is the definitive account of an extraordinary mind and life. --Excerpted from 2014 version, published by Princeton University Press. |

### From inside the book

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Page 100

Alan hit on the idea of the

' real number ' which was defined by some definite rule could be calculated by

one of his machines . For instance , there would be a machine to calculate the ...

Alan hit on the idea of the

**computable numbers**' . The crucial notion was that any' real number ' which was defined by some definite rule could be calculated by

one of his machines . For instance , there would be a machine to calculate the ...

Page 138

He assumed that words would be replaced by numbers taken from an official

code book and messages would be ... There they brought in no point of principle ,

but made it possible to represent all the

He assumed that words would be replaced by numbers taken from an official

code book and messages would be ... There they brought in no point of principle ,

but made it possible to represent all the

**computable numbers**as infinite ...Page 581

numbers : theory of numbers 133 – 5 ; ( see also Riemann ) binary numbers 138 ,

299 , 320 – 1 , 398 – 9 ; complex numbers 82 , 134 , 141 , 152 , 249 , 278n , 280 ,

299

numbers : theory of numbers 133 – 5 ; ( see also Riemann ) binary numbers 138 ,

299 , 320 – 1 , 398 – 9 ; complex numbers 82 , 134 , 141 , 152 , 249 , 278n , 280 ,

299

**computable numbers**100 , 102 , 124 , 133 Fibonacci numbers 207 – 8 ...### What people are saying - Write a review

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### Common terms and phrases

able Alan Turing Alan's allowed American appeared applied asked Bletchley boys brain British calculation called Cambridge complete connection continued course discussion effect electronic engineering Enigma experience explained fact German give given hand homosexual human idea important instructions intelligence interest kind King's knew later less letter logical look machine Manchester March mathematician mathematics matter means mechanical method mind move nature never Office once operations particular perhaps person physical plans play position possible practical principle probably problem quantum mechanics question reason result scientific secret showed suggested symbols taken talk theory thing thought took turn universal von Neumann wanted whole writing wrote