Description: Lemma for plyeq0 . If A is the coefficient function for a nonzero polynomial such that P ( z ) = sum_ k e. NN0 A ( k ) x. z ^ k = 0 for every z e. CC and A ( M ) is the nonzero leading coefficient, then the function F ( z ) = P ( z ) / z ^ M is a sum of powers of 1 / z , and so the limit of this function as z ~> +oo is the constant term, A ( M ) . But F ( z ) = 0 everywhere, so this limit is also equal to zero so that A ( M ) = 0 , a contradiction. (Contributed by Mario Carneiro, 22-Jul-2014)
Ref | Expression | ||
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Hypotheses | plyeq0.1 | |
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plyeq0.2 | |
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plyeq0.3 | |
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plyeq0.4 | |
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plyeq0.5 | |
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plyeq0.6 | |
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plyeq0.7 | |
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Assertion | plyeq0lem | |