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The Wigner-Eckart theorem is a theorem of representation theory and quantum mechanics allowing operators to be transformed from one basis to another. These transformations involve the use of Clebsch-Gordan coefficients.

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Wigner-Eckart theorem at Mathworld

Quantum mechanics Representation theory

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Topics: Wigner-Eckart Theorem, Wigner's Friend, Wigner d'Espagnat...

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