Source: wikibot/lambert-series
= Lambert series
{wiki=Lambert_series}
A Lambert series is a type of mathematical series named after the mathematician Johann Heinrich Lambert. It is defined in a particular form, usually involving a power series with specific coefficients. The general form of a Lambert series can be expressed as: \\\[ \\sum_\{n=1\}^\{\\infty\} \\frac\{n q^n\}\{1 - q^n\} \\\] where \\( |q| \< 1 \\) is a complex variable.