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Bibliographic Details
Main Authors: Manolescu, Ciprian, Rozenblyum, Nick
Format: Preprint
Published: 2026
Subjects:
Online Access:https://arxiv.org/abs/2605.08122
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Table of Contents:
  • We prove that the stable tame isomorphism, quasi-isomorphism, and derived Morita equivalence problems for semifree noncommutative differential graded algebras (DGAs) are all undecidable. This resolves half of Problem 5.16 from the K3 Problem List in Low-Dimensional Topology. We present two solutions, both obtained (essentially autonomously) by Gemini Deep Think / Aletheia.