Hello,

I want to compute powers of the Laplace-beltrami operator in some surface (e.g. cylinder):

https://en.wikipedia.org/wiki/Laplace_operator#Coordinate_expressions

and evaluate it for a given scalar function on the surface (e.g. a function on the cylinder).  I'm wondering if I only have to write the laplace-beltrami operator and then compute a simple power of it, or if I have to take care and compute the powers of the Laplace-beltrami operator first and then evaluate at the function on the cylinder. If the second option is the correct one (I think so), how can I compute that with maple? There is some trick way to compute powers of differential operators?

Thanks,

Fernando

I would like to plot a 2D contour plot in the botton of a 3D plot of a spacial curve. I don't know how to do that in maple, but I found something similar done in Matlab for a 2Dcontour plot in the botton of a 3D surface.

Can someone help me?

Thanks,

Fernando 

I want to write a procedure which recieves a natural N and print all the possible 2ˆN sequences of zeros and ones with size N.

 For instance, if I set N = 3; my procedure returns a set with 8 lists of zeros and ones: [[0,0,0],[1,0,0],[0,1,0],[0,0,1][1,0,1],[0,1,1],[1,1,1]] ;

Many thanks!

Hello,

I have a procedure wich is something like 

F:=proc(a,b,l) limit(f(a,b),b=l); end proc;

For my specific problem, the limit always exists and is a well defined function

After that, I would like to generate other functions, depending on F(a,b,l), e.g.:

G:=proc(a,b,N) add(F(a,b,l),l=1..N); end proc;

However, when I tried to do that, Maple inserts in G an unevaluated F, depending on the results of the limits. This makes G not work properly (unevaluated), since the limit is not computed before G. I tried to use some intermediate steps, like using unapply command, but it does not works.

If someone can help, I would appreciate.

Hello, 

I`m new with the Physics package. I have a Hamiltonian in a lattice written in terms of creation and annihilation operators. The Question is, How can I label a Creation and an Annihiliation operator for each site in the Lattice. WIth this, I can compute mean values and other stuffs associated with the Hamiltonian.

Many thanks in advance