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ProductLog[-Pi/2]

• To: mathgroup at smc.vnet.net
• Subject: [mg44160] ProductLog[-Pi/2]
• From: poujadej at yahoo.fr (Jean-Claude Poujade)
• Date: Fri, 24 Oct 2003 04:24:50 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

ProductLog[-Pi/2] should return I Pi/2 but doesn't...

In[1] := w E^w /. w -> I Pi/2
Out[1] = -Pi/2

In[2] := ProductLog[-Pi/2] // FullSimplify
Out[2] = ProductLog[-Pi/2]

In[3] := ProductLog[-Pi/2] // N // Chop
Out[3] = 1.5708 I

Could someone explain ? (I use Mathematica 4.1)

---
jcp

• Follow-Ups:
  • Re: ProductLog[-Pi/2]
    • From: "Peter Pein" <nospam@spam.no>