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CHAPTER 4. THEORY 92<br />

The exact same bound holds for k0that<br />

G2(un)(x, k) − G2(u)(x, k) = 4Cτ<br />

hk<br />

− 4Cτ<br />

hk<br />

x Kmax<br />

0<br />

−Kmax<br />

x Kmax<br />

0<br />

−Kmax<br />

This is the same as looking at two separate terms, where<br />

G2(un)(x, k) − G2(u)(x, k) = 4Cτ<br />

x<br />

hk 0<br />

+ 4Cτ<br />

x<br />

hk<br />

0<br />

e C(z−x)<br />

k<br />

e C(z−x)<br />

k<br />

Kmax<br />

−Kmax<br />

Kmax<br />

−Kmax<br />

e C(z−x)<br />

k u(z,k ′ )Tu(z,k − k ′ )dk ′ dz<br />

e C(z−x)<br />

k un(z,k ′ )Tun(z,k − k ′ )dk ′ dz.<br />

Tu(z,k − k ′ )[u(z,k ′ ) − un(x, k)] dk ′ dz<br />

[Tu(z,k − k ′ ) − Tun(z,k − k ′ )] dk ′ dzun(z,k ′ )<br />

= F 1 (x, k)+F 2 (x, k).

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