Existence of Solutions Boundary conditions 4 Sobolev spaces 4 Analytical techniques 2 Asymptotic analysis 2 Asymptotic behaviors 2 Asymptotic profiles 2 Basic results 2 Boundary value problems 2 Bounded domain 2 Concentration-compactness principle 2 Critical exponent 2 Dirichlet boundary condition 2 Dirichlet boundary conditions 2 Dirichlet type 2 Divergence operator 2 Divergence operators 2 Eigenvalues and eigenfunctions 2 Elliptic problem 2 Elliptic system 2 Ermakov invariant 2 Ermakov-Ray-Reid systems 2 Estimation problem 2 Existence and uniqueness results 2 Existence of solutions 2 Existence results 2 Finite dimensional space 2 Geometry 2 Hilbert spaces 2 Holmium 2