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)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*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 >

**References**:**Solving Third Order differential equation using Mathematica.***From:*amitesh <singh.amitesh@gmail.com>