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What does the symbol ##\supset## mean as used in equations (3.1) and (3.2) of
https://arxiv.org/pdf/1701.07427.pdf
https://arxiv.org/pdf/1701.07427.pdf
The symbol ##\supset## in equations (3.1) and (3.2) of the paper "https://arxiv.org/pdf/1701.07427.pdf" denotes an interaction Lagrangian, specifically indicating a subset of the total Lagrangian, denoted as ##\mathcal{L}##. This notation is utilized to streamline the representation of the equations without the need to define a new variable. The context suggests that the authors aim to emphasize the interaction components rather than the entire Lagrangian framework.
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