- #1
PineApple2
- 49
- 0
Hi, this is a rather mathematical question. The inner product between generators of a Lie algebra is commonly defined as [itex] \mathrm{Tr}[T^a T^b]=k \delta^{ab} [/itex]. However, I don't understand why this trace is orthogonal, i.e. why the trace of a multiplication of two different generators is always zero.