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<p>problems. Obvious examples include <a href="page.php?w=arithmetic">arithmetic</a> (abstracting concepts of number), <a href="page.php?w=geometry">geometry</a> (concepts of space), and <a href="page.php?w=probability">probability</a> (concepts of randomness and likelihood).</p>

<p><a href="page.php?w=G%C3%B6del%27s_incompleteness_theorem">Gödel's incompleteness theorem</a> shows that no consistent, <a href="page.php?w=recursively_enumerable">recursively enumerable</a> theory (that is, one whose theorems form a recursively enumerable set) in</p><p>
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