2022
DOI: 10.5802/aif.3444
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Homotopy transfer and formality

Abstract: In this paper, we prove that, given appropriate hypotheses, nformality of a differential graded algebraic structure is equivalent to the existence of a chain-level automorphism lifting a degree twisting isomorphism relative to a unit of order greater than n. A similar result with slightly different hypothesis was proved by Joana Cirici and the second author. We use the homotopy transfer theorem and an explicit inductive procedure in order to kill the higher operations. As an application of our result, we prove… Show more

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“…However, contrary to the situation here, that automorphism does not come directly from algebraic geometry. In [16], these formality results are proved over the ring double-struckZ$\mathbb {Z}_\ell$ instead of double-struckF$\mathbb {F}_\ell$. This paper uses homotopy transfer techniques instead of the $\infty$‐categorical methods used in the present paper.…”
Section: Main Results In the Cohomologically Graded Casementioning
confidence: 99%
“…However, contrary to the situation here, that automorphism does not come directly from algebraic geometry. In [16], these formality results are proved over the ring double-struckZ$\mathbb {Z}_\ell$ instead of double-struckF$\mathbb {F}_\ell$. This paper uses homotopy transfer techniques instead of the $\infty$‐categorical methods used in the present paper.…”
Section: Main Results In the Cohomologically Graded Casementioning
confidence: 99%