Canonical Commutation Relation

$[\hat{x},\hat{p}]=i\hslash$

• The operation above is a commutation
• $\hat{x}$ is the position operator
• $\hat{p}$ is the momentum operator

$[r_i,r_j]=[p_i,p_j]=0$

• In 3D, $[x,y]$ or $[p_x,p_y]$ for example is 0 where $i$ and $j$ don’t necessarily have to be the same or different