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Dickman function
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<p>In <a href="/facts/Analytic_number_theory/mrHbWwrx">analytic number theory</a>, the Dickman function or Dickman–de Bruijn function <i>ρ</i> is a <a href="/facts/Special_function/JETSeucA">special function</a> used to estimate the proportion of <a href="/facts/Smooth_number/pC6DVLJW">smooth numbers</a> up to a given bound. It was first studied by actuary Karl Dickman, who defined it in his only mathematical publication, which is not easily available, and later studied by the Dutch mathematician <a href="/facts/Nicolaas_Govert_de_Bruijn/pr2Hbxfm">Nicolaas Govert de Bruijn</a>. </p>