DIRAC MATRIX
Text: [QUANT MECH] Any one of four matrices, designated Yu(u = 1, 2, 3, 4), each having four rows and four columns and satisfying YvYu + YvYu = Ouv, where Ouv is the Kronecker delta function, which matrices operate on the four-component wave function in the Dirac equation. Also known as gamma matrix.
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