Symmetry Relations
A symbol is invariant under reflection in either diagonal:
These equations represent two symmetry operations of the associated Yutsis graph on 6 nodes.
The permutation of any two rows or any two columns yields a phase factor, where
For example:
There are 6 possible permutations of three rows, 6 possible permutations of three columns, and together with the 2 symmetries related to the diagonals these account for the 72 = 2*6*6 symmetry operations of the associated automorphism group of the graph.
Read more about this topic: 9-j Symbol
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He has no time to be anything but a machine.”
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