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MathGroup Archive 2000

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How to avoid complex exponents?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24931] How to avoid complex exponents?
  • From: "Peter Chan" <y6k at hotmail.com>
  • Date: Tue, 22 Aug 2000 16:22:41 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

What is the simplest way to avoid the complex exponents, i.e. 
exp((-1)^(1/3))
and exp((-1)^(2/3)), given by Mathematica 4.0 in the solution of the 
following
differential equation?

Thanks.

-----------------------------------------------------
Mathematica 4.0 :

In[1]:= DSolve[y''[x]+y'[x]+y[x]==0,y[x],x]

                                    2/3
                     C[1]       (-1)    x
Out[1]= {{y[x] -> ---------- + E          C[2]}}
                       1/3
                   (-1)    x
                  E

-----------------------------------------------------



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