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The statement that a property of a system does not change if the system is isolated.

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In the case of the Dirac Equation,what forbids the free electron to absorb a photon? (electr...

It is straightforward to show from relativistic kinematics that a free electron cannot absorb a photon, as shown in this previous thread. However, It is also known that using the Dirac equation, you …
Peter James Beierle's user avatar