Format of partial derivatives within sagemanifolds

[Oscar Alberto Castillo Felisola]

Dear community,

I'm using SAGE with SageManifolds to calculate Lie derivatives. First, I would like to congratulate all the team of developers, because day to day sagemanifolds get more useful. Next, the "problem".

I'm trying to find the most general rank two tensor compatible with O(3) symmetry. Here some code:

# The manifold
M = Manifold(4, 'M')

# The patch
X.<t,r,th,ph> = M.chart(r't r:(0,+oo) th:(0,pi):\theta ph:(0,2*pi):\phi')

# Killing vectors

Lx = M.vector_field('Lx')

Lx[:] = ( 0, 0, -cos(ph), cot(th)*sin(ph) )

Ly = M.vector_field('Ly')

Ly[:] = ( 0, 0, sin(ph), cot(th)*cos(ph) )

Lz = M.vector_field('Lz')

Lz[:] = ( 0, 0, 0, 1)

# The general tensor

T = M.tensor_field( 0, 2, 'T' )

for i in xrange(4):

for j in xrange(4):

T[i,j] = function("T%s%s" % (i,j))(t, r, th, ph)

# One of the Lie derivatives

LxT = T.lie_der(Lx)

LxT.display_comp() 

Then, the "problem" is that the PDE displayed show partial derivatives with respect to `th` or `ph` instead of using the LaTeX symbols as defined on the patch.

Is there a way to correct this behaviour?

Cheers.

[Eric Gourgoulhon]

Hi,

Le vendredi 1 avril 2016 20:23:29 UTC+2, Oscar Alberto Castillo Felisola a écrit :

Then, the "problem" is that the PDE displayed show partial derivatives with respect to `th` or `ph` instead of using the LaTeX symbols as defined on the patch.

Yes this is a current shortcoming of the display in SageManifolds (we are aware of it). It should be improved in a future version.

Best wishes,

Eric.

[o.castill...@gmail.com]

Thank you for your answer Eric, I suspected that was the issue! Of course, I want to thank again to all the development team for such a nice work.

--
You received this message because you are subscribed to a topic in the Google Groups "sage-support" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/sage-support/LOdI5lgGHPk/unsubscribe.
To unsubscribe from this group and all its topics, send an email to sage-support...@googlegroups.com.
To post to this group, send email to sage-s...@googlegroups.com.
Visit this group at https://groups.google.com/group/sage-support.
For more options, visit https://groups.google.com/d/optout.

--

_____________________________________

Oscar Castillo-Felisola.
Grupo de Fisica Teorica.
UTFSM -- CCTVal.
Av. Espana, 1680, Valparaiso-Chile.
______________________________________