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<p>formulated a different definition of integral, founded in <a href="page.php?w=Measure_%28mathematics%29">measure theory</a> (a subfield of <a href="page.php?w=real_analysis">real analysis</a>). Other definitions of integral, extending Riemann's and Lebesgue's approaches, were proposed. These approaches based on the real number system are the ones most common today, but alternative approaches exist, such as a definition of integral as the <a href="page.php?w=standard_part">standard part</a> of an infinite Riemann sum, based on the <a href="page.php?w=hyperreal_number">hyperreal number</a></p><p>
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