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Feb 20, 2017 at 20:52 comment added Stopple The zero is a source (spiral out) if $\text{Re}\zeta^\prime(\rho)>0$, and is a sink (spiral in) if $\text{Re}\zeta^\prime(\rho)<0$. This latter happens less often; the first example is zero number 127. See oeis.org/A153815
Feb 17, 2017 at 19:32 comment added მამუკა ჯიბლაძე Does not the Hadamard product formula imply that the picture is qualitatively the same at all zeros?
Feb 17, 2017 at 17:47 history edited Stopple CC BY-SA 3.0
added Polya vector field discussion.
Feb 11, 2017 at 0:31 history edited Stopple CC BY-SA 3.0
mis-stated what graphics represent
Feb 11, 2017 at 0:25 history answered Stopple CC BY-SA 3.0