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MathGroup Archive 1998

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Differential Equation evaluation




	Hi, I am new to Mathematica and just bought verison 3.0, I am trying to
solve a differential equation of the form:

F''' + F*F' + 1 - (F')^2 == 0

with boundry conditions for F, F', F'' at 0 and F' at infinity, is there
a way to handle this?  When I try this, if I include that boundry
condition at infinity  with the others, Mathematica tells me I have to
many constraints, if I leave it off I can solve it, if I leave off the
condition for F' at 0, it tells  me it can't find the value of variable
at the variable at 0.  So, my question, is how do I handle this in 
Mathematica.

I have another general question about the system.  I am using version
3.0 for Win95.  Often, if I make a syntax error, Mathematica will print
me an error message but then I can't be certain that any subsequent
error messages are valid.  The reason I say this is that I  will find
my error, correct it and then I will get another error message upon
evaluation.  After struggling with it for  a while, I will close it and
re-enter and what gave me errors prior to re-entering, evaluate fine. 
Is there some way to be sure that  the errors are valid?

Thanks for all of your help.

Shayne C. Rich
SLKBC@cc.usu.edu




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