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

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Kaidi, Ohmori, Zheng, https://arxiv.org/abs/2111.01141

Ohmori, Tizzano, https://arxiv.org/abs/2112.13445

Lee, Ohmori, Tachikawa. https://arxiv.org/abs/2108.05369