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<p>and <a href="page.php?w=definable_set">definability</a>. In these areas, computability theory overlaps with <a href="page.php?w=proof_theory">proof theory</a> and <a href="page.php?w=effective_descriptive_set_theory">effective descriptive set theory</a>.</p>

<p>Basic questions addressed by computability theory include:<br/>
* What does it mean for a <a href="page.php?w=function_%28mathematics%29">function</a> on the <a href="page.php?w=natural_number">natural number</a>s to be computable?<br/>
* How can noncomputable functions be classified</p><p>
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