By Andrew Hodges

It is just a mild exaggeration to claim that the British mathematician Alan Turing (1912-1954) stored the Allies from the Nazis, invented the pc and synthetic intelligence, and expected homosexual liberation via decades--all sooner than his suicide at age 41. This vintage biography of the founding father of laptop technology, reissued at the centenary of his start with a considerable new preface by way of the writer, is the definitive account of a rare brain and lifestyles. A gripping tale of arithmetic, desktops, cryptography, and gay persecution, Andrew Hodges's acclaimed ebook captures either the internal and outer drama of Turing's life.

Hodges tells how Turing's progressive inspiration of 1936--the proposal of a common machine--laid the root for the trendy desktop and the way Turing introduced the belief to sensible recognition in 1945 along with his digital layout. The publication additionally tells how this paintings was once without delay regarding Turing's best function in breaking the German Enigma ciphers in the course of international struggle II, a systematic triumph that used to be serious to Allied victory within the Atlantic. even as, this is often the tragic tale of a guy who, regardless of his wartime carrier, was once ultimately arrested, stripped of his safety clearance, and compelled to endure a humiliating remedy program--all for attempting to reside in truth in a society that outlined homosexuality as a criminal offense.

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**Additional resources for Alan Turing: The Enigma (The Centenary Edition)**

**Example text**

Similarly, A2 = 0 does not imply that A is a null matrix. The transpose of a product of matrices in a certain order equals the product of the transposed matrices in the opposite order, that is (ABC)' = C'B'A'. The determinant of a square matrix A is defined to have the same respective elements as A and is denoted by A or det A; if it is zero then the matrix is said to be singular, otherwise non-singular or regular. The following relations apply to the product of two square matrices of order n. IBAI = IBIC A ~ .

The value of a matrix is no more than the array of elements, there being no implication that these are combined in any algebraic way. Whereas work with deter46 47 MATRIX ALGEBRA AND LINEAR EQUATIONS minants involves the familiar algebra of numbers, work with matrices is based on an algebra which defines how arrays are combined in the sum, difference, product and quotient senses. In this section many of the terms to be used are described and the algebra of matrix addition is defined. A matrix for which m = 1, n > 1 has one row only and is called a row matrix or a row vector.

In the first term the natural order 1, 2, 3 occurs. In the second term the order 1, 3, 2 can be DETERMINANTS AND LINEAR EQUATIONS 41 made natural by interchanging 2 with 3; such a change is called an inversion. The suffices in the fourth term require two successive inversions to restore the natural order. When all six terms are considered in this way it is found that those associated with a plus sign require an even number of inversions, zero being taken as even, and those with a minus sign require an odd number of inversions to restore the natural order.

### Alan Turing: The Enigma (The Centenary Edition) by Andrew Hodges

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