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[Mathqa]rational functions
Posted:
Mar 2, 2001 5:11 PM


If f(x) = p(x)/q(x) is a rational function with coefficients in a finite extension of the rationals, and f(z) is a root of 1 for oo many z that are roots of 1, show that f(x) = c*x^n for some integer n.
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