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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeAug 7th 2017
    • (edited Aug 7th 2017)

    I have given interaction picture genuine content (the entry used to be effectively empty):

    gave it one section “In quantum mechanics” with the standard kind of material going from interacting Hamiltonians to the definition of the S-matrix, and then a section “In quantum field theory” with an outline of which steps in the previous discussion require special technical care and how.

    In the process I expanded the entry Dyson formula. (In the end I effectively rewrote it, but now with a little broader perspective and more pointers).