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Differential Equation Solution

  1. Oct 3, 2011 #1
    Hi,

    Does it necessary for a differential equation to have an analytic solution?

    Regards
     
  2. jcsd
  3. Oct 4, 2011 #2

    HallsofIvy

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    Staff Emeritus
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    That depends upon what you mean by "analytic solution". If you have a differential equation that gives some property of "dy/dx", then you can certainly expect y to be differentiable. And, if you have a differential equation that says dy/dx= f(x,y), where f is a differentiable function of x and y, then it follows that
    [tex]\frac{d^2y}{dx^2}= \frac{\partial f}{\partial x}+ \frac{\partial f}{\partial y}\frac{dy}{dx}[/tex]
    exists and then, by induction, all derivatives of y exist. Whether y must be "analytic" (if that is what you mean) is a little more complicated.
     
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