If a,b > 0 then W(-e^{-a} b) is negative, so the entire expression is positive. The only questionable equand in the sequence is, as you noticed, the fourth. But the trick there is that the k = -1 term in the sum outweighs the nonnegative terms. On Fri, May 30, 2008 at 3:14 PM, <rwg@sdf.lonestar.org> wrote:

near the end of www.tweedledum.com/rwg/idents.htm, suppose a,b>0. How can the 4th equand be negative, but not the 5th? --rwg

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