In this Note, we give a new proof of the uniqueness of mild solutions of th
e Navier-Stokes equation in C([0, T); (L-3(R-3))(3)). Th,,ain tool of the p
roof is the maximal LP-regularity of the Laplacian in (L-3(R-3))(3). (C) Ac
ademie des Sciences/Elsevier, Paris.