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Ultracategories as colax algebras for a pseudo-monad on CAT
Published 27 Feb 2025 in math.CT | (2502.20597v2)
Abstract: We show a result inspired by a conjecture by Shulman claiming that ultracategories as defined by Lurie are normal colax algebras for a certain pseudo-monad on the category of categories CAT. Such definition allows us to regard left and right ultrafunctors as defined by Lurie as instances of lax/colax algebras morphisms
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