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Fig. 3. This figure shows the basic elements of Feynmann diagrams of non-relativistic quantum mechanics. A long line with j represents 1/(EiEj), where Ei is the initial energy. A dot with two short lines represents the matrix element Vjk.
New Phys.: Sae Mulli 2022;72:537~543 https://doi.org/10.3938/NPSM.72.537
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