EIndexQ

• EIndexQ[index] gives True if index is contractible, that is, obeys the Einstein convention of representing a contraction when it appears in a tensor product together with is complementary character. It gives False otherwise.

• Indices of type A and B are currently always contractible.
• See: Section 2.1.
• See also: BlockedQ, PairQ.
• New in version 0.
• Last update: 16-V-2008 for version 0.9.5 of xTensor`.

Created by Mathematica  (May 16, 2008)