Re: O.D.E in Power Series
- To: mathgroup at smc.vnet.net
- Subject: [mg18271] Re: O.D.E in Power Series
- From: "Kevin J. McCann" <kevin.mccann at jhuapl.edu>
- Date: Fri, 25 Jun 1999 15:05:19 -0400
- Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
- References: <7ku0dk$9a1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Alan, Define z = x+3, the DE becomes: -3y[z] - 2 z y'[z] + y''[z] == 0 Which is solvable by DSolve in terms of hypergeometric functions. Careful, these functions can get large for some arguments. I am not sure why Mathematica can't see this simple transformation. Kevin Kevin J. McCann Johns Hopkins University APL ALAN S BLOOM <ALAN12 at prodigy.net> wrote in message news:7ku0dk$9a1 at smc.vnet.net... > I am trying to solve this equation below: > y''-2(x+3)y'-3y=0 with the DSolve command. > > DSolve [y''[x]-2(x+3)y'[x]-3y[x]==0,y[x],x] > > How can I make it work? > > Alan > >