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differential equation solve

• To: mathgroup at smc.vnet.net
• Subject: [mg68821] differential equation solve
• From: "elvis" <rapstone at gmail.com>
• Date: Sun, 20 Aug 2006 04:43:39 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Here we often use mathematica to solve differential equations, when I
encouter a equation with several constrains I set them to those values.
But it cannot solve it and have the following warnings:

    DSolve::deqx: Supplied equations are not differential equations of
the given functions.

Give a very simple differential equation here:

  DSolve[{y'[x] == r*y[x], y[0] == a}, y, x]

another equation:

\!\(DSolve[{\(x'\)[t] == r*x[t] \((1 - x[t]\/xm)\), x[0] == x0}, x,
t]\)

this face anothe prolbem

Can anyone help to "solve" this problem for me?
Thanks!

• Follow-Ups:
  • Re: differential equation solve
    • From: "Chris Chiasson" <chris@chiasson.name>