3
$\begingroup$

What do 1, 2, 3 represent in $\operatorname{U}(1)+\operatorname{SU}(2)+\operatorname{SU}(3)$?
If they are dimensions, how they can be added? or plus has another meaning?

  • 0
    $U(n)$ is the unitary group of $n\times n$ matrices. And $SU(n)$ is the special unitary group of $n\times n$ matrices. Should the + be a $\times$?2011-02-10
  • 2
    Are you talking about Lie groups or Lie algebras?2011-02-10
  • 0
    i guess Lie groups as i am not sure whether it is in gauge theory, how dimension 1x1 times 2x2 times 3x3? or U is matrix 1x2 times SU 2x3 times SU 3x3?2011-02-11
  • 0
    I don't quite understand what you're asking.2011-02-11

1 Answers 1