First eigenvalue and maximum principle for fully nonlinear singular operators
Isabeau Birindelli, Françoise Demengel · Advances in Differential Equations · 2006
In this paper we introduce the notion of first eigenvalue for fully nonlinear operators which are nonvariational but homogeneous. It is unnecessary to emphasize the importance of knowing the spectrum of a linear operator. When the operator is a uniformly elliptic operator of second order Lu =