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<p>studies possible axiom systems and their consequences.Since the first half of the 20th century, <a href="page.php?w=ZFC">ZFC</a> (<a href="page.php?w=Zermelo-Fraenkel_set_theory">Zermelo-Fraenkel set theory</a> with the <a href="page.php?w=axiom_of_choice">axiom of choice</a>) has been the axiom system most commonly used.</p>

<p><big> Context </big></p>
<p>Before the end of the 19th century, sets were not studied specifically, and they were not clearly distinguished from <a href="page.php?w=sequence_%28mathematics%29">sequence</a>s. Most mathematicians</p><p>
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