pde_Maple.pdf

节选段落一：
The source code for all the examples is available in the directory
ftp://ftp.cc.tut.fi /pub/math/piche/pde/
Instructions on how to configure your Web browser to open these files with
Maple are given at
http://www.maplesoft.com/technical/faq/maple/a29.html
for instructions on how to do this.
i
Contents


节选段落二：
∂
∂ t
w(x, y, z, t)
a2
= 0
The same change of variables can also be performed automatically by
Maple, without going through the matrix algebra:
> u:='u':
> PDE:=Diff(u,x,x)+Diff(u,y,y)+Diff(u,z,z)
> +b*u-Diff(u,t)/a^2=0;
PDE :=
(
∂2
∂x2
u
)
+
(
∂2
∂y2
u
)
+
(
∂2
∂z2
u
)
+ b u −
∂
∂ t
u
a2
= 0
> newPDE


节选段落三：
Maple uses this technique to compute the laplacian in
two and three dimensions.