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Re: Solving Third Order differential equation using Mathematica.
*To*: mathgroup at smc.vnet.net
*Subject*: [mg127390] Re: Solving Third Order differential equation using Mathematica.
*From*: Amitesh Singh <singh.amitesh at gmail.com>
*Date*: Fri, 20 Jul 2012 23:43:00 -0400 (EDT)
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*References*: <20120720075112.B88C36881@smc.vnet.net> <50096AC8.3090207@math.umass.edu>
Hi Murray,
Sorry for the typo. The correct eqn is
http://imageshack.us/photo/my-images/842/43659885.png/
Thanks
--
Amitesh
On Fri, Jul 20, 2012 at 7:57 PM, Murray Eisenberg <murray at math.umass.edu>wrote:
> 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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