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DSolve for a real function

• To: mathgroup at smc.vnet.net
• Subject: [mg127908] DSolve for a real function
• From: Andreas Talmon l'Armée at smc.vnet.net
• Date: Fri, 31 Aug 2012 03:59:25 -0400 (EDT)
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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

• References:
  • Re: reduction/simplification of hypergeometric-function-related formula
    • From: "Dr. Wolfgang Hintze" <weh@snafu.de>