MathGroup Archive 2002

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Re: DSolve solution validation


Vladimir Bondarenko <vvb at mail.strace.net> wrote:
>                              DSolve[y'[z] == Abs[y[z]], y[z], z]

this is a good example where the built-in human DSolve works better than
Mathematica's :-)

y'=abs(y) has the solution y = C e^z.  depending on the sign of C, y is
either always positive or always negative.

regards,
-gerhard


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