Abstract: In
this paper we study the following
Neumann-Robin boundary value problem:
wherea
< 0, l
> 0are
parameters and fÎC2[0, ¥)
such
that f(0)
< 0,and
also f
is increasing and concave up. We shall
investigate the existence and multiplicity of
nonnegative solutions and in particular, we
show the difference of results with respect to
different a’s.
Keywords and phrases: semipositone problems, nonnegative solutions, quadrature method.
