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.