$ExtrinsicKSign

• $ExtrinsicKSign defines the global sign of the extrinsic curvature tensor in terms of the derivative of a vector field: ExtrinsicK[-a, -b] = $ExtrinsicKSign Projector[ cd[-a][ n[-b] ] ].

• The default value is +1, following Wald's conventions, as usual.
• See: Section 4.6.
• See also: ExtrinsicK.
• New in version 0.
• Last update: 14-V-2008 for version 0.9.5 of xTensor`.

Created by Mathematica  (May 16, 2008)