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Fig. 4. Ajk is represented by a diagram which has a dot with a long line and a short line. The expansion coefficient cfi(n), which is in fact the transition amplitude, can be read off from a line with n dots corresponding to n interactions. A line segment between two adjacent dots represents all possible quantum states except the original one.
New Phys.: Sae Mulli 2022;72:537~543 https://doi.org/10.3938/NPSM.72.537
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