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Bell triangle
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the Bell triangle is a triangle of numbers analogous to <a href="/facts/Pascal%2527s_triangle/tb6BKXbc">Pascal's triangle</a>, whose values count <a href="/facts/Partition_of_a_set/VeP9g8CA">partitions of a set</a> in which a given element is the largest <a href="/facts/Singleton_(mathematics)/LtNVfujT">singleton</a>. It is named for its close connection to the <a href="/facts/Bell_number/LXzHyaIF">Bell numbers</a>, which may be found on both sides of the triangle, and which are in turn named after <a href="/facts/Eric_Temple_Bell/00WMLxa1">Eric Temple Bell</a>. The Bell triangle has been discovered independently by multiple authors, beginning with <a href="/facts/Charles_Sanders_Peirce/z76dNqhM">Charles Sanders Peirce</a> (1880) and including also <a href="/facts/Alexander_Aitken/UbhEranD">Alexander Aitken</a> (1933) and Cohn et al. (1962), and for that reason has also been called Aitken's array or the Peirce triangle. </p>