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Fig. 1. When a scalar field φ has the φ4 interaction, φ(1)=GV(φi) can be obtained from a digram with a dot and four lines. Three short lines represent φi, and a long line represents the propagator G.
New Phys.: Sae Mulli 2022;72:537~543 https://doi.org/10.3938/NPSM.72.537
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