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On Time Versus Space

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Abstract

It is shown that every deterministic multitape Turing machine of time complexity t(n)/log t(n). Consequently, for tape constructable t(n), the class of languages recognizable by multitape Turing machines of time complexity t(n) is strictly contained in the class of languages recognized by Turing machines of tape complexity t(n). In particular, the context sensitive languages can not be recognized in linear time by deterministic multitape Turing machines. Keywords and phrases: Turing machines, time complexity, tape complexity.

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1975-12

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Cornell University

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computer science; technical report

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http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR75-264

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technical report

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