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Re: DSolve difficulties ...

  • To: mathgroup at
  • Subject: [mg111860] Re: DSolve difficulties ...
  • From: Helen Read <hpr at>
  • Date: Sun, 15 Aug 2010 07:40:07 -0400 (EDT)
  • References: <i45rdj$g3o$>
  • Reply-to: HPR <read at>

On 8/14/2010 6:33 AM, Slide wrote:
> Yesterday I typed in the following command line, into the student
> version of Mathmatica .
> DSolve[y''[x] == 1/(y[x]*y[x]), y[x], x]
> and got a complicated Solve command and expression back with the
> comment 'The equations appear to involve the variables to be solved
> for in an essentially non-algebraic way.'

I get a perfectly good solution.

> OK, that was yesterday, fortunately I didn't close the session.
> However, now when I try the same command, I get a null response.

Try it in a fresh session. Remember that Mathematica remembers 
everything you do in a session, and you might have done something that 
defined x or y or y[x] in some way.

Helen Read
University of Vermont

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