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the contraction of 5 gamma matrices cannot work properly for other index #19
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Unfortunately, a canonical order does not necessarily mean the simplest expression. The canonical order here involves lexicographically ordering the indices, whereas in your last example, you could get a simpler expression with a different index order. This is a general problem with computer algebra, not specific to xTensor or gamma matrices. |
OK. Thank you for your explainations. |
Dear Leo,
I download your example Gamma matrices notebook file and it works well on my local laptop.
But I found when I contract 5 gamma matrices with different indexes, the compact results cannot be obtained as showed in my attached screenshot file.
Do you know how to fix this problem?
Best,
Langtian
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