Description: Lemma for prmrec . If the series F was convergent, there would be some k such that the sum starting from k + 1 sums to less than 1 / 2 ; this is a sufficient hypothesis for prmreclem5 to produce the contradictory bound N / 2 < ( 2 ^ k ) sqrt N , which is false for N = 2 ^ ( 2 k + 2 ) . (Contributed by Mario Carneiro, 6-Aug-2014)
Ref | Expression | ||
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Hypothesis | prmrec.1 | |
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Assertion | prmreclem6 | |