I am wondering what the meaning of X is in formulations such as SU(3) X SU(2) X U(1). The symbol is used a lot but I've never seen it explained. I'm assuming it's not any kind of multiplication but ... Clarification would be appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

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# Meaning of X as in SU(3) X SU(2) X U(1)

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