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<p>and f may take a string and return the string obtained by reversing the digits of the input (so f(0101) = 1010).Other types of problems include <a href="page.php?w=search_problem">search problem</a>s and <a href="page.php?w=optimization_problem">optimization problem</a>s.</p>

<p>One goal of computability theory is to determine which problems, or classes of problems, can be solved in each model of computation.</p>

<p><big> Formal models of computation </big></p>
<p>A <a href="page.php?w=model_of_computation">model of computation</a> is a formal description</p><p>
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