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<p>sometimes called <a href="page.php?w=Computable_function">effectively calculable</a>.</p>

<p><big>Definition</big></p>
<p>Formally, a method is called effective to a specific class of problems when it satisfies the following criteria:</p>

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* It consists of a <a href="page.php?w=wikt%3Afinite">finite</a> number of exact, finite instructions.<br/>
* When it is applied to a problem from its class:<br/>
** It always finishes (terminates) after a finite number of steps.<br/>
** It always produces a correct answer.<br/>
* In principle, it can be done by</p><p>
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