Debye¶

Debye(x, n)¶

Debye function of order $n$ .

$\forall x \in \Rset, \forall n \in \Nset^* \text{and} \, n \leq 20, \quad \mathrm{D}_n(x) = \frac{n}{x^n} \int_0^x \frac{t^n}{\exp(t)-1}\di{t}$