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<p>which the concept of <a href="page.php?w=natural_numbers">natural numbers</a> can be expressed, can include all <a href="page.php?w=truth">true</a> statements about them. As a result, some domains of knowledge cannot be formalized, accurately and completely, as mathematical theories. (Here, formalizing accurately and completely means that all true propositions--and only true propositions--are derivable within the mathematical system.) This limitation, however, in no way precludes the construction of mathematical theories that formalize large</p><p>
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