[Date Index] [Thread Index] [Author Index]

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.