What does the symbol ⊃ mean in equations 3.1 and 3.2?

[George Jones]

What does the symbol $\supset$ mean as used in equations (3.1) and (3.2) of

https://arxiv.org/pdf/1701.07427.pdf

 

[Haborix]

Looks very odd to me. From the surrounding text they appear to only be discussing a "subset" of the total Lagrangian, $\mathcal{L}$. That's my best guess. The usual option would be to define a new variable, but I guess this is meant to avoid doing that.

 

[Vanadium 50]

It's the interaction Lagrangian and not the total Lagrangian.