Sei ${\displaystyle {}f:\mathbb {R}$ :\rightarrow \mathbb {R} } so definiert

${\displaystyle f(x)=\int _{-\infty }^{+\infty }{\frac {1}{t^{4}+x^{2}t^{2}+1}}\mathrm {d} t.}$

${\displaystyle {}f}$

${\displaystyle {}f}$