2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68722The purpose of this note is to extend to any space dimension the bilinear estimate for eigenfunctions of the Laplace operator on a compact manifold (without boundary) obtained in a previous work in dimension 2. We also give some related trilinear estimates.6 pagesAnalysis of PDEsSpectral Theorytext