AbstractIndexQ

• AbstractIndexQ[symbol] yields True if symbol has been defined as an abstract-index symbol and False otherwise.

• Each abstract-index has an upvalue for this function.
• This function gives False on abstract down-indices.
• See: Section 2.2.
• See also: AIndexQ, DefAbstractIndex.
• New in version 0.
• Last update: 23-IX-2007 for version 0.9.3 of xTensor`.

Created by Mathematica  (May 16, 2008)