Gosei, I been meaning to write to you about this, but I haven't
been able to phrase the question right. I had a same problems,
and that generated a discussion of why grad, div, curl, and laplacian
don't follow the same noun/verb rules that diff and integrate do?
Does you package replace the vect and various tensor packages?
Are they better?
I want to enter in the equations of the Einstein/Cartan/Evans (ECE)
Relativity Theory in maxima. ECE incorporates Cartan's expression
of torsion in GR, yielding a unified field theory. Geometry = Physics.
What are the right tools to use?
(Your email address causes delivery failures).
Tom Widlar
???? wrote:
> hi Tommy
>
> you may use diff_form package,share/diff_form/.
> curl -->hodge star(exterior differemtiayion) such h_st(d())
> (%i1) load("diff_form.mac")$
> (%i2)
> fstar_with_clf([x,y,z],[x,y,z],(aa:vtof1([0,0,a*exp(-%i*beta*x)]),h_st(d(aa))));
> - %i beta x
> (%o2) %i a beta Dy %e
> please read .../share/diff_form/example.txt
>
> thanks
> Gosei Furuya
>
>
> 2007/1/23, Tommy Li <tommycli at ucla.edu <mailto:tommycli at ucla.edu>>:
>
> I'm trying to get Maxima to actually evaluate a curl.
>
> I loaded the "vect" package, and here is the output:
>
> (%i2) scalefactors([[x,y,z],x,y,z]);
>
> (%o2) DONE
> (%i3) A:[0,0,a*exp(-%i*beta*x)];
>
> - %I BETA x
> (%o3) [0, 0, a %E ]
> (%i4) curl(A);
>
> - %I BETA x
> (%o4) CURL [0, 0, a %E ]
>
> So after I take the curl, the output has the curl as an operator.
> How do
> I get it to actually evaluate the curl?
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