📄 alternation.html

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<H1>alternation</H1>
<P>
(definition)

<P>
<strong>Definition:</strong>
A <a href="modelofcompu.html" tppabs="http://hissa.nist.gov/dads/HTML/modelofcompu.html"><em>model of computation</em></a> proposed by A. K. Chandra, L. Stockmeyere, and D. Kozen, which has two kinds of states, AND and OR.  The definition of accepting computation is adjusted accordingly.
<P><strong>See also</strong>
<a href="timespace.html" tppabs="http://hissa.nist.gov/dads/HTML/timespace.html"><em>time/space complexity</em></a>, <a href="turingmachin.html" tppabs="http://hissa.nist.gov/dads/HTML/turingmachin.html"><em>Turing machine</em></a>.
<P><em>Note:
First proposed as a model for parallel computation, it has been widely used to prove complexity bounds on problems. See A. K. Chandra and L. J. Stockmeyer, "Alternation", pp 98-108, and D. Kozen, "On Parallelism in Turing Machines", pp 89-97, both in Proccedings of Seventeenth Annual IEEE Symposium on Foundations of Computer Science, 1976.</em>
<P>Author: <a href="terms.html#authorSKS" tppabs="http://hissa.nist.gov/dads/terms.html#authorSKS">SKS</a>

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Entry modified Sat Sep  4 17:09:56 1999.<BR>
HTML page formatted Wed Dec 22 09:34:40 1999.

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