| 11. | Otherwise, it's just given by the matrix elements of p.
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| 12. | The computation of physical observables from matrix elements of operators requires some care.
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| 13. | By index matching, the matrix element is:
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| 14. | The following year Edward Condon extended the rules to non-diagonal matrix elements.
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| 15. | The off-diagonal Hamiltonian matrix elements were given as proportional to the overlap integral.
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| 16. | And M _ s is the matrix element of an interaction Hamiltonian H _ 1 where
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| 17. | This construction can be extended to include off-diagonal matrix elements and gauge projections.
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| 18. | This Taylor expansion gives the following matrix element
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| 19. | The tunnel matrix element, given by
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| 20. | The off-diagonal matrix elements satisfy
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