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MathGroup Archive 1990

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Re: DSolve

  • Subject: Re: DSolve
  • From: uunet!yoda.ncsa.uiuc.edu!paul%wri (Paul Abbott)
  • Date: Sat, 10 Mar 90 17:11:26 CST
  • Apparently-to: mathgroup-send at yoda.ncsa.uiuc.edu

I think that I posted a solution to this before.  Here is another attempt.
Note that DSolve allows the boundary conditions to be entered as equations:

Mathematica (sun3.68881) 1.2 (November 6, 1989) [With pre-loaded data]
by S. Wolfram, D. Grayson, R. Maeder, H. Cejtin,
   S. Omohundro, D. Ballman and J. Keiper
with I. Rivin and D. Withoff
Copyright 1988,1989 Wolfram Research Inc.
 -- Terminal graphics initialized --

In[1]:= ?DSolve
DSolve[eqn, y[x], x] solves differential equations for the function y[x] with
   independent variable x. DSolve[{eqn1, eqn2, ...}, {y1[x1], y2[x2], ...},
   {x1, x2, ...}] solves a list of differential equations. Equations can
   either be differential equations or constraints: a differential equation
   may have the form F[y[x], y'[x], ..., Derivative[n][y][x], x] == 0;
   constraints may be of the form Derivative[k][y][pti]== vali.

In[1]:= DSolve[{x'[t]==-t, x[0]==1},x[t],t]

                       2
                      t
Out[1]= {{x[t] -> 1 - --}}
                      2

In[2]:= ^D



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