Constructs a trivial extension DG-algebra and a unitally positive A∞-algebra, yielding a direct proof that smooth 3-fold flops are classified by their contraction algebras.
Booth, Singularity categories via the derived quotient, Adv.\ Math.\ 381 (2021), Paper No
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Trivial extension DG-algebras, unitally positive $A_\infty$-algebras, and applications
Constructs a trivial extension DG-algebra and a unitally positive A∞-algebra, yielding a direct proof that smooth 3-fold flops are classified by their contraction algebras.