| Author |
Comment/Response |
cipocip
|
 01/20/12 04:43am
I am trying to do this for parameter i0 in Mathematica 7:
DSolve[{y'[x] + 0.9 y[x] == -0.5 y[x]^2, y[0] == i0}, y[x], x]
but get
DSolve::bvnul: For some branches of the general solution, the given boundary conditions lead to an empty solution
In Mathematica 5 this used to work, the answer being :
45(i0/(9+5 i0))/(-5 e^(0.9 t)+25(i0/(9+5 i0)))
Is there a workaround in Mathematica 7 ?
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