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I have often seen this phrase used in at least two frequent contexts,

  • One uses the notation of $\omega_{AB}$ (the matrix $\{ [0 , I],[-I,0]\}$) to denote the symplectic form for $USp$ group.

  • One uses the notation $\epsilon_{AB}$ (the matrix $\{[1,0],[0,-1]\}$) for $SU(2)$

I would like to know what is the precise definition and meaning of this.

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