Re: A "singular" equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg14751] Re: A "singular" equation*From*: "W. K. Bertram" <wkb at ansto.gov.au>*Date*: Thu, 12 Nov 1998 02:17:49 -0500*Organization*: Australian Nuclear Science and Technology Organisation*References*: <72bf2q$k3l@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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