If $\chi$ is a Dirichlet character mod k, then the Dirichlet L-function L(s,$\chi)$ has trivial zeros at negative integer points, i.e. $\chi (- 1)=(-1)\sp n$ implies $L(-n,\chi)=0$. Usually this result is proved with the aid of the functional equation for the L-function. As the functional equation is only valid for primitive characters, some additional arguments are necessary.
In this note the author gives a very short proof using the representation of L(s,$\chi)$ by the Hurwitz zeta function $\zeta$ (s,a). The only property of $\zeta$ (s,a) he needs is proved by replacing z by -z in the contour integral of $\zeta$ (s,a).