  We study minimal reductions of edge ideals of graphs and determine
restrictions on the coefficients of the generators of these minimal reductions.
We prove that when $I$ is not basic, then $\core{I}\subset \m I$, where $I$ is
an edge ideal in the corresponding localized polynomial ring and $\m$ is the
maximal ideal of this ring. We show that the inclusion is an equality for the
edge ideal of an even cycle with an arbitrary number of whiskers. Moreover, we
show that the core is obtained as a finite intersection of homogeneous minimal
reductions in the case of even cycles. The formula for the core does not hold
in general for the edge ideal of any graph and we provide a counterexample. In
particular, we show in this example that the core is not obtained as a finite
intersection of general minimal reductions.
