Hello! Is there any rule to do sums and products like the one in the attached picture (Lie.png) without going through all the math theory behind? I understand the first (product) and last (sum) terms, but I am not sure I understand how you go from one to another.(adsbygoogle = window.adsbygoogle || []).push({});

Thank you!

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# I Lie Algebra in Particle Physics simplified

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