Radial solutions of equations and inequalities involving the -Laplacian.
Radial solutions of singular nonlinear biharmonic equations and applications to conformal geometry.
The Paneitz equation in hyperbolic space
Positivity and anti-maximum principles for elliptic operators with mixed boundary conditions
We consider linear elliptic equations in bounded Lipschitz domains with mixed boundary conditions on . The main feature of this boundary value problem is the appearance of both in the equation and in the boundary condition. In general we make no assumption on the sign of the coefficient . We study positivity principles and anti-maximum principles. One of our main results states that if is somewhere negative, and then there exist two eigenvalues , such the positivity principle...
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