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CHAPTER 4. THEORY 97<br />

X. Letδ>0. For k>δ,wehave<br />

x<br />

G1(u)(x, k) =<br />

0<br />

dz C<br />

k<br />

Kmax<br />

C(z−x)<br />

e k h(z,k) ¯<br />

−Kmax<br />

u(z,k ′ )dk ′ .<br />

We can think of this term as an integral operator whose input is an L 2 ([0,L]) function<br />

given by<br />

and kernel function is given by<br />

Kmax<br />

u(z,k<br />

−Kmax<br />

′ )dk ′<br />

C<br />

k<br />

C(z−x)<br />

e k h(z,k). ¯<br />

For k>δ, the kernel function is continuous. Therefore, the integral operator is a<br />

compact map from L 2 ([0,L]) to C([0,L] × [δ, Kmax]). Since Kmax<br />

−Kmax un(x, k ′ )dk ′ ⇀<br />

Kmax<br />

−Kmax ū(x, k′ )dk ′ in L 2 ([0,L]), then G1(un)(x, k) converges uniformly to G1(ū)(x, k)<br />

for δ

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