DownIndex

• DownIndex[index] converts index into a covariant index.

• DownIndex has been defined on all known types of indices. For an unknown type of index it returns the original input with a minus sign in front.
• See: Section 2.1.
• See also: UpIndex, DownIndexQ.
• New in version 0.
• Last update: 14-V-2008 for version 0.9.5 of xTensor`.

Created by Mathematica  (May 16, 2008)