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<p><big> Definition </big></p>
<p>Let  and  be discrete-time <a href="page.php?w=stochastic_process">stochastic process</a>es and . The pair  is a hidden Markov model if</p>

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*  is a <a href="page.php?w=Markov_process">Markov process</a> whose behavior is not directly observable ("hidden");<br/>
* ,</p>

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:for every , , and</p><p>
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