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Was (wer) ist 9-j symbol - definition
9-j symbol
![[[Jucys diagram]] for the Wigner 9-j symbol. The diagram describes a summation over six [[3-jm symbol]]s. Plus signs on each nodes indicate an anticlockwise reading of the lines for the 3-jm symbol, whereas minus signs indicate clockwise. Due to its symmetries, there are many ways in which the diagram can be drawn.](https://commons.wikimedia.org/wiki/Special:FilePath/Jucys diagram for Wigner 9-j symbol.svg?width=200 "[[Jucys diagram]] for the Wigner 9-j symbol. The diagram describes a summation over six [[3-jm symbol]]s. Plus signs on each nodes indicate an anticlockwise reading of the lines for the 3-jm symbol, whereas minus signs indicate clockwise. Due to its symmetries, there are many ways in which the diagram can be drawn.")
In physics, Wigner's 9-j symbols were introduced by Eugene Paul Wigner in 1937. They are related to recoupling coefficients in quantum mechanics involving four angular momenta
3-j symbol
COEFFICIENTS COUPLED WITH ANGULAR MOMENTUM
3j symbol; Wigner 3-j symbol; 3j-symbol; 3jm-symbol; 3-jm symbols; Three-j symbol; Wigner 3j-symbol; 3-jm symbol; Wigner 3-j symbols
In quantum mechanics, the Wigner 3-j symbols, also called 3-jm symbols, are an alternative to Clebsch–Gordan coefficients for the purpose of adding angular momenta. While the two approaches address exactly the same physical problem, the 3-j symbols do so more symmetrically.
Chengdu J-9
PROPOSED INTERCEPTOR AIRCRAFT
CAC J-9
The Chengdu J-9 (Chinese: 歼-9) was an interceptor aircraft that was cancelled during development in the People's Republic of China (PRC). It was proposed in 1964 by the 601 Institute (Shenyang) as a higher-performing alternative to the Shenyang J-8.
