- #1

- 11

- 1

$$[M^{\mu\nu},M^{\rho\sigma}] = i\hbar\Big(g^{\mu\rho}M^{\nu\sigma}-(\mu\leftrightarrow\nu)\Big)-(\rho\leftrightarrow\sigma)$$

I have never seen the strange double-arrow notation in any linear algebra book before. Is this notation at all standard and if so, what does it mean?