Consider the equation
where F is the potential of f with F(0) = 0.
We will first consider the solvability of (5.1) when
for some (a, b) ∈ ℝ2 and a bounded potential operator p ∈ C(D, H) with
We say that (5.1) is resonant at infinity if (a, b) ∈ Σ(A), otherwise it is ...