In this paper we locally
classify the surfaces Ms2 in the 3-dimensional Lorentz-Minkowski space 𝕃3 verifying
the equation Δx = Ax + B, where A is an endomorphism of 𝕃3 and B is a constant
vector.
We obtain that classification by proving that Ms2 has constant mean curvature
and in a second step we deduce Ms2 is isoparametric.