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<p>which guarantees the existence of infinite sets. The mathematical concept of infinity and the manipulation of infinite sets are widely used in mathematics, even in areas such as <a href="page.php?w=combinatorics">combinatorics</a> that may seem to have nothing to do with them.</p>

<p>In <a href="page.php?w=physics">physics</a> and <a href="page.php?w=cosmology">cosmology</a>, it is an open question <a href="page.php?w=Universe">whether the universe is spatially infinite or not</a>.</p>

<p><big>History</big></p>
<p>Ancient cultures had various ideas</p><p>
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