On the existence of multiple positive solutions for a certain class of elliptic problems
Volume 66 / 2004
                    
                    
                        Banach Center Publications 66 (2004), 251-262                    
                                        
                        MSC: 35J20, 35J25.                    
                                        
                        DOI: 10.4064/bc66-0-17                    
                                    
                                                Abstract
We investigate the existence of solutions for the Dirichlet problem including the generalized balance of a membrane equation. We present a duality theory and variational principle for this problem. As one of the consequences of the duality we obtain some numerical results which give a measure of a duality gap between the primal and dual functional for approximate solutions.