Hi everyone.(adsbygoogle = window.adsbygoogle || []).push({});

I believe to have read somewhere (but now I can't find it) that any operator in QM is expressible in terms of the x and p operators. Obviously the spin operator is not, so this is not entirely true. But can we say something along those lines? Which operators are expressible in terms of x and p?

I'm thinking about this because in Dirac's original paper on the Dirac equation, he says that the alpha operators(matrices) are not functions of either x nor p, which makes sense. Can we conclude something about the alpha operators based on this?

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Express arbitrary operator in terms of x and p

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

Loading...

Similar Threads - Express arbitrary operator | Date |
---|---|

I Expression for state function | Jul 16, 2017 |

I Maximally entangled state expression and generalization | May 5, 2017 |

I Expression for Uncertainty of Arbitrary Operator | Mar 12, 2016 |

Express arbitrary state in second quantization | Oct 2, 2010 |

**Physics Forums - The Fusion of Science and Community**