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Re: "Nice" complex form

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131592] Re: "Nice" complex form
  • From: Itai Seggev <itais at wolfram.com>
  • Date: Tue, 10 Sep 2013 03:32:26 -0400 (EDT)
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On Mon, Sep 09, 2013 at 12:06:09AM -0400, sam.takoy at yahoo.com wrote:
> Hi,
> 
> Can I get
> 
> Assuming[a - 4 < 0, Sqrt[a - 4]]
> 
> to "simplify" to
> 
> I Sqrt[4 - a]
> 
> ?
> 
> Thanks,
> 
> Sam

In[58]:= Refine[Sqrt[a - 4], a - 4 < 0]


Out[58]= I Sqrt[4 - a]

Refine makes the sort of transformations an actual computation would make given
the appropriate conditions.
 
--
Itai Seggev
Mathematica Algorithms R&D
217-398-0700 



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