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<H1>model of computation</H1>
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(definition)

<P>
<strong>Definition:</strong>
A formal, abstract definition of a computer.  Using a model one can more easily analyze the intrinsic execution time or memory space of an <a href="algorithm.html" tppabs="http://hissa.nist.gov/dads/HTML/algorithm.html"><em>algorithm</em></a> while ignoring many implementation issues.  There are many models of computation which differ in computing power (that is, some models can perform computations impossible for other models) and the cost of various operations.
<P><strong>See also</strong>
<a href="turingmachin.html" tppabs="http://hissa.nist.gov/dads/HTML/turingmachin.html"><em>Turing machine</em></a>, <a href="randomaccess.html" tppabs="http://hissa.nist.gov/dads/HTML/randomaccess.html"><em>random access machine</em></a>, <a href="bigOnotation.html" tppabs="http://hissa.nist.gov/dads/HTML/bigOnotation.html"><em>big-O notation</em></a>, <a href="primitivrecr.html" tppabs="http://hissa.nist.gov/dads/HTML/primitivrecr.html"><em>primitive recursive</em></a>, <a href="cellulartmtn.html" tppabs="http://hissa.nist.gov/dads/HTML/cellulartmtn.html"><em>cellular automaton</em></a>, <a href="cellprobemdl.html" tppabs="http://hissa.nist.gov/dads/HTML/cellprobemdl.html"><em>cell probe model</em></a>, <a href="pointermachn.html" tppabs="http://hissa.nist.gov/dads/HTML/pointermachn.html"><em>pointer machine</em></a>, <a href="alternation.html" tppabs="http://hissa.nist.gov/dads/HTML/alternation.html"><em>alternation</em></a>, <a href="alternatngTr.html" tppabs="http://hissa.nist.gov/dads/HTML/alternatngTr.html"><em>alternating Turing machine</em></a>, <a href="nondetrmtur.html" tppabs="http://hissa.nist.gov/dads/HTML/nondetrmtur.html"><em>nondeterministic Turing machine</em></a>, <a href="oracleTur.html" tppabs="http://hissa.nist.gov/dads/HTML/oracleTur.html"><em>oracle Turing machine</em></a>, <a href="probablturng.html" tppabs="http://hissa.nist.gov/dads/HTML/probablturng.html"><em>probabilistic Turing machine</em></a>, <a href="unvrslTrngmc.html" tppabs="http://hissa.nist.gov/dads/HTML/unvrslTrngmc.html"><em>universal Turing machine</em></a>, <a href="multiprocssr.html" tppabs="http://hissa.nist.gov/dads/HTML/multiprocssr.html"><em>multiprocessor model</em></a>, <a href="workdepthmdl.html" tppabs="http://hissa.nist.gov/dads/HTML/workdepthmdl.html"><em>work-depth model</em></a>, <a href="parallelrndm.html" tppabs="http://hissa.nist.gov/dads/HTML/parallelrndm.html"><em>parallel random-access machine</em></a>.
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>

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Entry modified Fri Dec  3 08:36:44 1999.<BR>
HTML page formatted Wed Dec 22 09:35:52 1999.

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