The existence of non-quasi-isomorphic DGAs equivalent as MU-algebras
The existence of non-quasi-isomorphic DGAs equivalent as MU-algebras
Let and be differential graded algebras (DGAs), and let denote the complex cobordism spectrum. The MU-algebra equivalence conjecture. There exist DGAs and that are not quasi-isomorphic but are equivalent as -algebras. This would give examples of DGAs distinguished by their algebraic homotopy type but identified by their -algebra structure; the statement is presented as still open.
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Primary source
Haldun Özgür Bayındır and Markus Land, “Towards the classification of DGAs with polynomial homology”, arXiv:2509.14015 (2025).
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