Answered: Please explain the math behind how this…

Please explain the math behind how this went from an expectation value of the commuter of the hamiltonian and the momentum, to just the commuter. (the problem defines Ptot = P1+P2)

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

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Please explain the math behind how this went from an expectation value of the commuter of the hamiltonian and the momentum, to just the commuter. (the problem defines Ptot = P1+P2)

Ehrenfest's theorem states that
dt (Prot) = -1/1/1 ( [Prot, H])
iħ
1
iħ
=
[P₁+ P2, H]

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