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SingleInvariants

SingleInvariants[g, order]
gives a basis of single invariants of the Riemann tensor at order in derivatives of the metric g.
  • A single invariant is a monomial of Riemann tensors.
  • The second argument order has standard level specitification.
  • The Invar database must be installed in order for SingleInvariants to work correctly. It can be downloaded from http://www.xact.es/Invar/.
  • The following options can be given:
IncludeDualsFalsewhether to include dual invariants or not.