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<h1 align=center> An inequality for the logarithmic derivative of xi
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 The Riemann Hypothesis is true if and only if 
$$\Re \frac{\xi'(s)}{\xi(s)}>0$$
for $\Re s>1/2$ (see Hinkkanen [
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<a href="http://www.ams.org/msnmain?fn=130&s1=98d:30047&pg1=MR">MR 98d:30047</a>
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See also Lagarias' paper (to appear in Acta Arithmetica) 
at www.research.att.com/~jcl/doc/positivity.ps\begin{rawhtml}
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Back to the 
<a href="http://www.aimath.org/WWN/rh/"> main index</a> 
for The Riemann Hypothesis.
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