On Computable Numbers, with an Application to the Entscheidungsproblem (1936)
“The machine may also change the square which is being scanned, but only by shifting it one place to right or left.”
On Computable Numbers, with an Application to the Entscheidungsproblem (1936)
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Do you have more details about the quote "The machine may also change the square which is being scanned, but only by shifting it one place to right or left." by Alan Turing?
Alan Turing 33
British mathematician, logician, cryptanalyst, and computer… 1912–1954Related quotes
“The "scanned symbol" is the only one of which the machine is... "directly aware."”
However, by altering its m-configuration the machine can effectively remember some of the symbols which it has "seen" (scanned) previously.
On Computable Numbers, with an Application to the Entscheidungsproblem (1936)
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Source: An Introduction to Cybernetics (1956), Part I: Mechanism, p. 9: Chapter 2 Change, lead paragraph.
Context: The most fundamental concept in cybernetics is that of "difference", either that two things are recognisably different or that one thing has changed with time. Its range of application need not be described now, for the subsequent chapters will illustrate the range abundantly. All the changes that may occur with time are naturally included, for when plants grow and planets age and machines move some change from one state to another is implicit. So our first task will be to develop this concept of "change", not only making it more precise but making it richer, converting it to a form that experience has shown to be necessary if significant developments are to be made.
Part 1.3 Rights of Man
1790s, Rights of Man, Part I (1791)
Tales of a Traveler (1824), Preface, p. 7.
Source: Tales of a Traveller