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