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On lax transformations, adjunctions, and monads in $(\infty,2)$-categories

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arxiv 2002.01037 v2 pith:4DHI7DHB submitted 2020-02-03 math.CT math.AT

classification math.CTmath.AT
keywords inftycategoriestransformationsidentifymonadsadjunctionscategorycolax
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abstract

We use the basic expected properties of the Gray tensor product of $(\infty,2)$-categories to study (co)lax natural transformations. Using results of Riehl-Verity and Zaganidis we identify lax transformations between adjunctions and monads with commutative squares of (monadic) right adjoints. We also identify the colax transformations whose components are equivalences (generalizing the "icons" of Lack) with the 2-morphisms that arise from viewing $(\infty,2)$-categories as simplicial $\infty$-categories. Using this characterization we identify the $\infty$-category of monads on a fixed object and colax morphisms between them with the $\infty$-category of associative algebras in endomorphisms.

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Cited by 2 Pith papers

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  1. On dualizability and invertibility in the higher Morita category

    math.CT 2026-07 conditional novelty 8.0 of 10

    An E_n-algebra is (n+1)-dualizable in the higher Morita category exactly when it is dualizable as a module over each sphere-shaped factorization homology, confirming conjectures of Lurie and Brochier–Jordan–Safranov–Snyder.

  2. Large condensation in enriched $\infty$-categories

    math.CT 2025-06 conditional novelty 6.0 of 10

    The paper extends condensation theory for higher symmetries from fusion n-categories to arbitrary enriched monoidal ∞-categories, using monoidal Eilenberg-Moore functors and iterated module categories.

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