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MathGroup Archive 1998

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Re: A "singular" equation

  • To: mathgroup at
  • Subject: [mg14751] Re: A "singular" equation
  • From: "W. K. Bertram" <wkb at>
  • Date: Thu, 12 Nov 1998 02:17:49 -0500
  • Organization: Australian Nuclear Science and Technology Organisation
  • References: <72bf2q$>
  • Sender: owner-wri-mathgroup at

David Withoff wrote:

> 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]

Dear David,

I have exactly the same problem on my system as the previous writer. I'm
running Mathematica version 3.0.0 on a 200Mhz Pentium Pro under Windows
95. When I try to execute the above command I get a "This program has
performed an illegal operation ..." message and the notebook freezes
up. Is this a feature of this particular verion of  Mathematica? If so,
maybe Wolfram might consider offering its affected customers an upgrade
to a more recent version  at a much better rate than the A$700 - A$800
price that was quoted to me for an upgrade from version 3.0.0 to 3.0.1.

   Bill Bertram

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