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MathGroup Archive 1998

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Re: A "singular" equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14740] Re: [mg14704] A "singular" equation
  • From: David Withoff <withoff>
  • Date: Wed, 11 Nov 1998 17:53:42 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

> Trying to solve an ode ("Euler's" equation) Mathematica consistently
> crashes as follows:
> 
> % math
> Mathematica 3.0 for Solaris
> Copyright 1988-96 Wolfram Research, Inc.
>  -- Terminal graphics initialized --
> 
> In[1]:= DSolve[(1-x^2)y'[x]^2==(1-y[x]^2),y[x],x] Bus Error (core
> dumped)
> %
> 
> This seems pretty bad form, I must say.

This worked ok for me.  Check with Wolfram Research tech support. Maybe
you have a corrupted/old/etc copy of Mathematica.

% math
Mathematica 3.0 for Solaris 
Copyright 1988-97 Wolfram Research, Inc.
 -- Terminal graphics initialized -- 

In[1]:= DSolve[(1-x^2)y'[x]^2==(1-y[x]^2),y[x],x]

                                 2          2              2      2
                  x - Sqrt[-1 + x ] + x C[1]  + Sqrt[-1 + x ] C[1]
Out[1]= {{y[x] -> -------------------------------------------------}}
                                       2 C[1]

Dave Withoff
Wolfram Research


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