Electronic Journal of Differential Equations, Conference 06 (2001), pp. 29-44. Title: Behaviour near zero and near infinity of solutions to elliptic equalities and inequalities. Authors: Marie-Francoise Bidaut-Veron (CNRS UMR, Tours, France) Abstract: Here we consider elliptic equations and inequalities involving quasilinear operators in divergence form and nonlinear lower order terms: $$-\mathop{\rm div}\left(\mathcal{A}(x,u,\nabla u)\right) \geq |x|^\sigma u^Q\quad(Q>0,\sigma \in \mathbb{R}), $$ in dimension $N\geq 3$. We study the asymptotic behaviour of the solutions and give {\it a priori} estimate and non-existence results. Published January 8, 2001. Math Subject Classifications: 35J55, 35J60. Key Words: A priori estimates; non-existence results; degenerate quasilinear inequalities.