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

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

Choi, Cordova, Hsin, Lam, Shao, https://arxiv.org/abs/2111.01139

Bah, Bonetti, Leung, Weck, https://arxiv.org/abs/2111.01790