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MathGroup Archive 2000

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Rply

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24263] Rply
  • From: pecar at masfak.masfak.ni.ac.yu (Predrag Rajkovic)
  • Date: Wed, 5 Jul 2000 23:10:44 -0400 (EDT)
  • Organization: The Math Forum
  • References: <8jrdc2$e2t@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Log[x] is not singlevalued function in complex domain.
It is important which branch is chosen.
For example, Mathematica gives:
In[11]:=
Log[E^(1-I)]
Out[11]=
1-I

But,

In[10]:=
Log[E^(1-5I)]
Out[10]=
(1-5 I)+2 I \[Pi]
so  Log[E^x] is not x.


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