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46 JOHN A. ZUEHLKE<br />
Proof of (2). If xn + yn = zn for x, y, z, n positive integers with n ~ 2, fix z and<br />
consider the graph of the function y = yl zn - xn<br />
(0, z- 1)<br />
(0, 0)<br />
Q,"<br />
I<br />
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