On the 6d Origin of Non-invertible Symmetries in 4d

 Plavnik, Schopieray, Yu, Zhang, https://arxiv.org/abs/2111.05228

Bah, Bonetti, Leung, Weck, https://arxiv.org/abs/2112.07796

Apruzzi, Bonetti, García Etxebarria, Hosseini, Schäfer-Nameki, https://arxiv.org/abs/2112.02092

Del Zotto, García Etxebarria, Schäfer-Nameki, https://arxiv.org/abs/2203.10097