[sage-devel] Re: Functional derivative consistent with current .diff( )

2013-04-21 Thread adsmith
On Saturday, April 20, 2013 2:03:07 PM UTC-4, ManDay wrote: > I'd like to be able to derive in the following manner: > > x = var( "x" ); > J = function( "g",x ); > f = function( "f",g ); > > # like so > > x1 = var( "x1" ); > > f.diff( J( x1 ) ); > > which is the functional f derivate with respect

[sage-devel] Re: A new DifferentialAlgebra package needs reviewers

2012-07-23 Thread adsmith
Thanks for posting this. It looks interesting. I'll take a careful look at it in the coming weeks to see whether it is appropriate to use as a base for the moving frames / exterior differential geometry package need/plan to build. On Monday, July 23, 2012 12:38:01 PM UTC-4, François Boulier wro

[sage-devel] Re: Anyone developing Differential System and Cartan--Kaehler in sage?

2011-12-15 Thread adsmith
On Dec 15, 8:48 am, Jason Grout wrote: > On 12/15/11 7:38 AM, adsmith wrote: > > I'm not an expert in the area, but > ishttp://www.sagemath.org/doc/reference/tensor.htmluseful to you?  You > can see fromhttp://trac.sagemath.org/sage_trac/ticket/9650some of the > peopl

[sage-devel] Anyone developing Differential System and Cartan--Kaehler in sage?

2011-12-15 Thread adsmith
Hi everyone, I am in need of a package to carry out computations in exterior algebra, differential ideals, and various aspects of the Cartan-- Kähler theorem. I have used Jeanne Clelland's "Cartan" package for Maple[1] extensively, and I have been thinking about reproducing it in sage (with Jeann