[mg14751] Re: A "singular" equation

[W. K. Bertram]

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.

Cheers,
Bill Bertram