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Show that the parity operator $P$ defined by $$ P \psi(\vec{r}) = \psi(-\vec{r}) $$ obeys the commutation relations.
- $[ \hat{P}, \hat{x} ]_+ =0$
- $[ \hat{P}, \hat{p}_x ] _+ =0$
- $[ \hat{P}, \hat{x}^2 ] =0$
- $[ \hat{P}, \hat{\vec{p}}^{2}] =0$
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4727:Diamond Point
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