Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1999
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
>
>




  • Prev by Date: Re: Graphic simple?
  • Next by Date: Re: Inserting Adobe pdf files in ver. 4 notebooks
  • Previous by thread: Re: O.D.E in Power Series
  • Next by thread: Re: O.D.E in Power Series