  In this paper, we prove that isotropic Gaussian functions are characterized
by a rearrangement inequality for weighted perimeter in dimensions $n \ge 2$
within the class of non-negative weights in $L^1(\mathbb{R}^n) \cap
W^{1,1}_{loc}(\mathbb{R}^n)$. More specifically, we prove that within this
class generalized Ehrhard symmetrization is perimeter non-increasing for all
Borel sets $E$ in all directions $\vec{v}$ if and only if the distribution
function is an isotropic Gaussian.
