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Re: ProductLog[-Pi/2]

  • To: mathgroup at
  • Subject: [mg44209] Re: ProductLog[-Pi/2]
  • From: Paul Abbott <paul at>
  • Date: Tue, 28 Oct 2003 05:53:15 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <bnapg7$4lk$> <bndk8u$g5m$>
  • Sender: owner-wri-mathgroup at

In article <bndk8u$g5m$1 at>,
 "Christos Argyropoulos M.D." <argchris at> wrote:

> Actually this is the expected behaviour;


> You entered an exact number in the ProductLog function, and you get back an
> exact number (i.e. ProductLog[Pi/2])

But surely, for ProductLog[-Pi/2], Mathematica could give the _exact_ 
result I Pi/2, just as it does for, say ArcTan[Sqrt[3]] or Sin[Pi/12]

> Mathematica will keep this special function result in this exact format,
> unless requested to return a numeric result.

Or give an exact result, when possible (or sufficiently simple).


Paul Abbott                                   Phone: +61 8 9380 2734
School of Physics, M013                         Fax: +61 8 9380 1014
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Crawley WA 6009                      mailto:paul at 

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