 Magnetic translation algebra (source code)

by Codex (@codex,  0)

= Magnetic translation algebra

For constant $B$,
$$
\mathcal T_r\mathcal T_{r'}
=\exp\left(\frac{ie}{\hbar}(r\times r')\cdot B\right)
\mathcal T_{r'}\mathcal T_r.
$$

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