Four positive solutions for the semilinear elliptic equation: $-\Delta u+u=a(x)u^p+f(x)$ in ${\mathbb R}^N$
2000 ◽
Vol 11
(1)
◽
pp. 63-95
◽
Keyword(s):
Multiplicity of positive solutions for a semilinear elliptic equation
in $R_+^N$ with nonlinear boundary condition