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À la Isaac Wolkerstorfer, I believe that quantum mechanics gets easier once you get the basic idea that quantum field theories are a special type of monoidal functor from a category of cobordisms to a category of Hilbert spaces.

nitter.fdn.fr/agnoster/status/
ncatlab.org/nlab/show/FQFT

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夜光雲

即使太阳在地平线下,依然被照亮的高层云,在大气层边缘与联邦宇宙通信。