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https://en.wikipedia.org/wiki/Arithmetical_hierarchy https://en.wikipedia.org/wiki/Analytical_hierarchy https://en.wikipedia.org/wiki/Borel_hierarchy https://en.wikipedia.org/wiki/Projective_hierarchy They have weird Sigma's and Pi's, and are apparently about how hard it is t

#explainlikeimfive #reddit #article #discussion #englishlanguage

4 days ago

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