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DSolve for a real function

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  • Subject: [mg127908] DSolve for a real function
  • From: Andreas Talmon l'Armée at
  • Date: Fri, 31 Aug 2012 03:59:25 -0400 (EDT)
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  • References: <k1k8np$90f$> <>

Hi All

Is there a way to tell mathematica to solve only for real solutions. My 
differential equation is of the kind

y''''[x]+a y[x]==0

a= constant coefficient

I know that I get 4 komplex eigenvalues which are complex conjungated. 
But y[x] is a real function.
Solving this equation with DSolve always gets a complex function y[x].

Any Ideas.

Thanks, Andreas

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