Singular limits for a 4-dimensional semilinear elliptic problem with exponential nonlinearity
We investigate the following quasilinear and singular problem,where is an open bounded domain with smooth boundary, , , , and . As usual, if , is arbitrarily large if , and if . We employ variational methods in order to show the existence of at least two distinct (positive) solutions of problem (P) in . While following an approach due to Ambrosetti-Brezis-Cerami, we need to prove two new results of separate interest: a strong comparison principle and a regularity result for solutions...
Using a Hardy-type inequality, the authors weaken certain assumptions from the paper [1] and derive existence results for equations with a stronger degeneration.