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)*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>*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

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