BasisQ

• BasisQ[symbol] yields True if symbol has been defined as a basis or chart and False otherwise.

• Each basis has an upvalue for this function.
• Bases are handled in the package xCoba`, but this function is already defined in xTensor`.
• See: Section 4.7.
• See also: Basis, $Bases.
• New in version 0.
• Last update: 25-IX-2007 for version 0.9.3 of xTensor`.

Created by Mathematica  (May 16, 2008)