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Science Forum Index » Math - Symbolic Forum » Symbolic program and tensor calculus
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| Matej Pavsic |
 Posted: Wed Feb 14, 2007 8:39 am |
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I am searching for a useful package for manipulation of
tensors with symbolic indices. There is a big
difference in doing symbolic algebra of tensors with symbolic
indices or with the components. Stensor was such a program
which kept tensor indices in it s symbolic form during the
calculation. This is what we normally do in theoretical physics,
only at the end we eventually wish to calculate the components
of tensors for specific cases.
Stensor was the best package I have had so far, but I have
a version which worked with a VAX machine. So I would
like to have an updated version of Stensor or an equivalent
(or even better program) that works with UNIX machines
or with PC's. |
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| Chris Card |
| Posted: Fri Feb 16, 2007 5:23 am |
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Hi Matej
On 14 Feb, 12:39, Matej Pavsic <matej.pav...@ijs.si> wrote:
Quote: I am searching for a useful package for manipulation of
tensors with symbolic indices. There is a big
difference in doing symbolic algebra of tensors with symbolic
indices or with the components. Stensor was such a program
which kept tensor indices in it s symbolic form during the
calculation. This is what we normally do in theoretical physics,
only at the end we eventually wish to calculate the components
of tensors for specific cases.
Stensor was the best package I have had so far, but I have
a version which worked with a VAX machine. So I would
like to have an updated version of Stensor or an equivalent
(or even better program) that works with UNIX machines
or with PC's.
The most recent information I can find is this from Malcolm MacCallum:
http://www.maths.qmul.ac.uk/hyperspace/general/97Jan.3.html
There is an ftp archive there ftp://ftphost.maths.qmul.ac.uk/pub/
sheep/ which appears
to have a linux version of Stensor, but I don't know if it works - you
may have to
get Reduce to make it work.
HTH
Chris |
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| Jos Vermaseren |
| Posted: Mon Feb 19, 2007 11:52 am |
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Matej Pavsic wrote:
Quote:
I am searching for a useful package for manipulation of
tensors with symbolic indices. There is a big
difference in doing symbolic algebra of tensors with symbolic
indices or with the components. Stensor was such a program
which kept tensor indices in it s symbolic form during the
calculation. This is what we normally do in theoretical physics,
only at the end we eventually wish to calculate the components
of tensors for specific cases.
Stensor was the best package I have had so far, but I have
a version which worked with a VAX machine. So I would
like to have an updated version of Stensor or an equivalent
(or even better program) that works with UNIX machines
or with PC's.
You may want to look at one of the following packages:
FORM (http://www.nikhef.nl/~form)
cadabra by Kaspar Peeters. This was published recently but a bit
of googling should find it.
In both programs the standard is to keep the indices symbolic and
only write them out if specifically asked for.
Maybe cadabra is what you need.
Jos Vermaseren |
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| Paul Abbott |
| Posted: Tue Feb 20, 2007 8:37 am |
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In article <45d9c72a$0$330$e4fe514c@news.xs4all.nl>,
Jos Vermaseren <t68@nikhef.nl> wrote:
Quote: Matej Pavsic wrote:
I am searching for a useful package for manipulation of
tensors with symbolic indices. There is a big
difference in doing symbolic algebra of tensors with symbolic
indices or with the components. Stensor was such a program
which kept tensor indices in it s symbolic form during the
calculation. This is what we normally do in theoretical physics,
only at the end we eventually wish to calculate the components
of tensors for specific cases.
Stensor was the best package I have had so far, but I have
a version which worked with a VAX machine. So I would
like to have an updated version of Stensor or an equivalent
(or even better program) that works with UNIX machines
or with PC's.
You may want to look at one of the following packages:
FORM (http://www.nikhef.nl/~form)
cadabra by Kaspar Peeters. This was published recently but a bit
of googling should find it.
See
http://www.aei.mpg.de/~peekas/cadabra/
http://au.arxiv.org/abs/hep-th/0701238
for more information on cadabra.
Cheers,
Paul
_______________________________________________________________________
Paul Abbott Phone: 61 8 6488 2734
School of Physics, M013 Fax: +61 8 6488 1014
The University of Western Australia (CRICOS Provider No 00126G)
AUSTRALIA http://physics.uwa.edu.au/~paul |
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