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CHAPTER 4. THEORY 87<br />

we have shown that we can choose x and y close enough so that<br />

Kmax<br />

0<br />

|G1(u)(x, k) 2 − G1(u)(y, k) 2 |dk ≤ γ<br />

2 .<br />

Using a very similar argument for the case k0. We want to show that Kmax<br />

−Kmax G2(u)(x, k ′ ) 2 dk ′ is<br />

continuous. So<br />

Kmax<br />

<br />

G2(u)(x, k)<br />

−Kmax<br />

2 Kmax<br />

dk − G2(u)(y, k)<br />

−Kmax<br />

2 Kmax<br />

<br />

dk<br />

= [G2(u)(x, k)<br />

−Kmax<br />

2 − G2(u)(y, k) 2 <br />

<br />

]dk<br />

Kmax<br />

<br />

<br />

<br />

= [G2(u)(x, k) − G2(u)(y, k)][G2(u)(x, k)+G2(u)(y, k)]dk<br />

−Kmax<br />

Kmax<br />

≤ |G2(u)(x, k) − G2(u)(y, k)|[|G2(u)(x, k)| + |G2(u)(y, k)|]dk<br />

−Kmax<br />

≤ 8τ<br />

h<br />

<br />

Kmax<br />

2KmaxuXT ∞ |G2(u)(x, k) − G2(u)(y, k)|dk.<br />

−Kmax

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