$CommuteFreeIndices

$CommuteFreeIndices is a Boolean global variable stating whether the free indices of equivalent objects in an expression to be canonicalized can be permuted among them or not. The final result of the canonicalization generally depends on this choice.

• The default initial value is True.
• See: Section 7.2.
• See also: xSort.
• New in version 0.
• Last update: 27-X-2007 for version 0.9.3 of xTensor`.


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