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Method of distinguished element
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<p>In the <a href="/facts/Mathematics/pxTouaz4">mathematical</a> field of <a href="/facts/Enumerative_combinatorics/AtqWU2bj">enumerative combinatorics</a>, <a href="/facts/Identity_(mathematics)/LR46j4uR">identities</a> are sometimes established by arguments that rely on singling out one "distinguished element" of a set. </p>