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Re: Solving Third Order differential equation using Mathematica.
*To*: mathgroup at smc.vnet.net
*Subject*: [mg127389] Re: Solving Third Order differential equation using Mathematica.
*From*: Murray Eisenberg <murray at math.umass.edu>
*Date*: Fri, 20 Jul 2012 23:42:40 -0400 (EDT)
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*Reply-to*: murray at math.umass.edu
I cannot answer your question now, but I did notice two things about
your differential equation:
(1) You have an expression (1 - ax)^7. Should "ax" actually be "a x"
(i.e., a product of a and x, rather than a new constant "ax")?
(2) You also have an expression (1 - y). By any chance should that be
(1 - x)?
On 7/20/12 3:51 AM, amitesh wrote:
> Hi,
>
> I am trying to solve a third order differential eqn in mathematica.
> DSolve[{1/30 f'''[x] - f[x] (2 a^3/(1 - x a)^3 + 1/(1 - x)^3) - 24 a/
> (1 - y) (1/(1 - x)^7 - a^5/(1 - ax)^7) == 0, f[0] == 0,
> f''[0] == 0}, f[x], x]
> I am running this eqn for last 1 hour :/ why does Mathematica take so
> much time?
>
> Will Mathematica able to solve this eqn?
>
>
> Thanks
> Amitesh
>
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
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