       Solving sets of differential equations -- this should be easy...

• Subject: [mg3341] Solving sets of differential equations -- this should be easy...
• From: axf at HPP.Stanford.EDU (Adam Farquhar)
• Date: 29 Feb 1996 15:57:34 -0600
• Approved: usenet@wri.com
• Distribution: local
• Newsgroups: wri.mathgroup
• Organization: Knowledge Systems Lab, Stanford University
• Sender: daemon at wri.com

```
I have what should be a very simple problem, but I can't convince
Mathematica to give me an answer in the form that I need.  I have sets
of equations like

{x[t] == y'[t], y[t] == 5}

that I would like to solve.  If I try the obvious

DSolve[{x[t] == y'[t], y[t] == 5},x[t],t]

I get
Out=
{{x[t] -> y'[t]}}

as the result.  I would like, of course, to see {{x[t] -> 0}}. How can I
get Mathematica to give me this answer?

The equations are being generated automatically, and Mathematica is being
called remotely.  The solution should be in the form of a single
self-contained request with no side-effects.

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