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## Main Question or Discussion Point

This looks like it could be useful...

http://arxiv.org/abs/physics/0509108

GRTensorJ - Books is an active interface to a small part of the computer algebra systems GRTensorII (for Maple) and GRTensorM (for Mathematica) with the specific intent of providing students of General Relativity with an advanced programmable calculator-style tool. All standard functions associated with a classical tensor approach to the subject are available thus reducing these to "elementary functions". This is not a traditional database. The database entries are spacetimes and calculations are done in real time. All spacetimes are referenced directly by equation number in ten current (and classic) texts in notation as close as possible to the original text. The tool is now available free of charge from http://grtensor.org/teaching/ [Broken]

http://arxiv.org/abs/physics/0509108

**A tool for teaching General Relativity**

Authors: Kayll Lake

Comments: 6 pages, 5 figures. Further information at this http URL

Subj-class: Physics Education; Computational Physics

Authors: Kayll Lake

Comments: 6 pages, 5 figures. Further information at this http URL

Subj-class: Physics Education; Computational Physics

GRTensorJ - Books is an active interface to a small part of the computer algebra systems GRTensorII (for Maple) and GRTensorM (for Mathematica) with the specific intent of providing students of General Relativity with an advanced programmable calculator-style tool. All standard functions associated with a classical tensor approach to the subject are available thus reducing these to "elementary functions". This is not a traditional database. The database entries are spacetimes and calculations are done in real time. All spacetimes are referenced directly by equation number in ten current (and classic) texts in notation as close as possible to the original text. The tool is now available free of charge from http://grtensor.org/teaching/ [Broken]

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