ridiculous results with DSolve
- To: mathgroup at smc.vnet.net
- Subject: [mg33363] ridiculous results with DSolve
- From: "Diego Catalano Ferraioli" <diego_catalano_ferraioli at yahoo.com>
- Date: Sun, 17 Mar 2002 05:33:20 -0500 (EST)
- Reply-to: "Diego Catalano Ferraioli" <dcatalano at unisa.it>
- Sender: owner-wri-mathgroup at wolfram.com
Hi all !
Actually I'm interested in implementation of algoritms based on the Lie
theory of differential equations.
I was searching for a suitable language for an efficient implementation
of these algoritms when I discovered that (for example):
if you try to solve with Mathematica the trivial PDE
D[u[x,y],x,x]==0
then a Dump occurs, but if you try to solve the equivalent equation
D[u[x,y],y,y]==0
then Mathematica gives the wrong solution
u[x,y]=
C[1][x]+C[2][y] .
This result is ridiculous !!!!
How it is possible?
Diego