User:Sansern

testing

${\hat {\mathbf {S} }}_{j}=({\hat {S}}_{j}^{x},{\hat {S}}_{j}^{y},{\hat {S}}_{j}^{z})={\frac {\hbar }{2}}({\hat {\sigma }}_{x},{\hat {\sigma }}_{y},{\hat {\sigma }}_{z})$ $({\hat {\sigma }}_{x},{\hat {\sigma }}_{y},{\hat {\sigma }}_{z})$