Emergent symmetry - a new way to understand strongly interacting gapless states and quantum field theoryIt is well known that gapless states have emergent symmetry. If we greatly generalize symmetry to include anomalous non-invertible ones, and beyond, the generalized emergent symmetry may largely characterize gapless states. We may understand a gapless state via its emergent symmetry. Here, I will use a simple language of conservation ...