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Random-access Turing machine
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Random-access Turing machine : ウィキペディア英語版
Random-access Turing machine

In computational complexity, a field of computer science, random-access Turing machines are an extension of Turing machines used to speak about small complexity classes, especially for classes using logarithmic time, like DLOGTIME and the Logarithmic Hierarchy.
== Definition ==

On a random-access Turing machine, there is a special ''pointer'' tape of logarithmic space accepting a binary vocabulary. The Turing machine has a special state such that when the binary number on the ''pointer'' tape is 'p', the Turing machine will write on the working tape the ''p''th symbol of the input.
This lets the Turing machine read any letter of the input without taking time to move over the entire input. This is mandatory for complexity classes using less than linear time.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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