@Article{Chabrowski2014, author = "Chabrowski, Jan", title = "On a singular nonlinear Neumann problem", journal = "Opuscula Math.", year = "2014", volume = "34", number = "2", pages = "271--290", doi = "http://dx.doi.org/10.7494/OpMath.2014.34.2.271", url = "http://dx.doi.org/10.7494/OpMath.2014.34.2.271", abstract = "We investigate the solvability of the Neumann problem involving two critical exponents: Sobolev and Hardy-Sobolev. We establish the existence of a solution in three cases: \(\text{(i)}\;\ 2\lt p+1\lt 2^*(s),\) \(\text{(ii)}\;\ p+1=2^*(s)\) and \(\text{(iii)}\;\ 2^*(s)\lt p+1 \leq 2^*,\) where \(2^*(s)=\frac{2(N-s)}{N-2},\) \(0\lt s\lt 2,\) and \(2^*=\frac{2N}{N-2}\) denote the critical Hardy-Sobolev exponent and the critical Sobolev exponent, respectively.", keywords = "Neumann problem, critical Sobolev exponent, Hardy-Sobolev exponent Neumann problem", issn = "1232-9274" }