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Home Page:http://contrib.xact.es/
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Example xAct notebooks with common usage patterns
A field theory inspired xAct package for Mathematica
Spinor calculus in xAct
Computer algebra for cosmological perturbation theory
Exterior Calculus for xAct
Produce TeX versions of expressions derived with xAct
xPrint for xAct: graphical interface for tensor input and manipulation
xAct xTension to define tensors as divergence-free
xAct xTension to define tensors as trace-free
Trivial xTension example package
Web site for xAct-contrib community
Home of the xIST and COPPER packages