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Student Support Forum: 'Dsolve returns the input' topicStudent Support Forum > General > "Dsolve returns the input"

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John
12/07/11 10:45pm

Hello,

I input

DSolve[{r''[s] - r[s]*\[Theta]''[s] ==
0, Theta''[s] + (1/r[s])*r'[s]*Theta[s] ==
0}, {r, Theta}, s]

and it returns that as the answer. I assume that it can't solve this system as it is. Do I have to enter more information somehow?

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Subject (listing for 'Dsolve returns the input')
Author Date Posted
Dsolve returns the input John 12/07/11 10:45pm
Re: Dsolve returns the input Quinn McKinsey 12/09/11 5:41pm
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