MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: DSolve and K$31, i am puzzled

  • To: mathgroup at
  • Subject: [mg57094] Re: [mg57078] DSolve and K$31, i am puzzled
  • From: Chris Chiasson <chris.chiasson at>
  • Date: Sun, 15 May 2005 03:03:48 -0400 (EDT)
  • References: <>
  • Reply-to: Chris Chiasson <chris.chiasson at>
  • Sender: owner-wri-mathgroup at

It might be a dummy variable. I have seen it when Mathematica is
evaluating complicated integrals and needs to return the result in
terms of an integral (in the dummy variable).

In other words, the output looked like: Integral[ function of $K2 ,{$K2,a,b}]

By the way, when I evaluated your input, I didn't have the dummy
variable in my output:


5.0 for Microsoft Windows (November 18, 2003)

On 5/14/05, David Boily <dsboily at> wrote:
> When i try to solve this differential equation with the command:
> In[1]:= DSolve[f'[t] == Sign[p2 Exp[F2 t] - p1 Exp[F1 t] + p], f[t], t]
> where p, p1, p2, F1 and F2 are constants i get the answer
>                         F1 t       F2 t
>                   (p - E     p1 + E     p2) (-K$31 + t)
> Out[1]= {{f[t] -> ------------------------------------- + C[1]}}
>                                F1 t       F2 t    2
>                     Sqrt[(p - E     p1 + E     p2) ]
> what the hell is K$31? I have tried to find out with google or
> the mathematica 5 online docs but have found nothing.
> can someone enlighten me?
> David Boily
> Centre for Intelligent Machines
> McGill University
> Montreal, Quebec

Chris Chiasson
1 (810) 265-3161

  • Prev by Date: Re: DSolve and K$31, i am puzzled
  • Next by Date: Re: Integrate gives wrong answer
  • Previous by thread: Re: Re: DSolve and K$31, i am puzzled
  • Next by thread: Re: DSolve and K$31, i am puzzled