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double lie bimodule 1goldman-turaev 1intersection operations 1lie bialgebra 1surface decomposition 1

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20242026
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math.RA2026

Undecidability of the quasi-isomorphism problem for semi-free dg algebras via the cobar construction

Manuel Rivera

We explain how the undecidability of the quasi-isomorphism and derived Morita equivalence problems for semi-free finitely presented dg associative algebras follows as an immediate…