Inégalités de Harnack pour les solutions d'équations du type courbure scalaire prescrite

We prove some a priori estimates in dimension n⩾2 for equations of type prescribed scalar curvature. In the particular case of the unit sphere S2 we give an estimation of the constant c in the inequality supS2u+infS2u⩾c. To cite this article: S. Skander Bahoura, C. R. Acad. Sci. Paris, Ser. I 341 (2005).