ContractCurvature

• ContractCurvature[expr] replaces all contracted Riemann tensors by Ricci and all contracted Ricci tensors by RicciScalar.
• ContractCurvature[expr,covd] does it only for the given covariant derivative.
• ContractCurvature[expr, covd, Riemann] only replaces Riemann by Ricci.
• ContractCurvature[expr, covd, Ricci] only replaces Ricci by RicciScalar.

• See: Section 4.5.
• See also: DefCovD, CurvatureRelations.
• New in version 0.
• Last update: 17-X-2007 for version 0.9.3 of xTensor`.

Created by Mathematica  (May 16, 2008)