LI

• LI[expr] is interpreted as a label-index.

• Label-indices can be given a height: LI[expr] is a "contravariant label" and -LI[expr] (not LI[-expr]) is a "covariant label".
• Label-indices can have any internal structure. In particular they can have several elements.
• See: Section 2.5.
• See also: LIndexQ.
• New in version 0.
• Last update: 24-IX-2007 for version 0.9.3 of xTensor`.

Created by Mathematica  (May 16, 2008)