Core--cocore Koszul duality conjecture

Let XX be a Weinstein manifold with contact boundary YY, let L=iILiL=\bigcup_{i\in I}L_i be its relative skeleton decomposed into smooth Lagrangians, and let CiC_i be a cocore or linking disk intersecting LL at a point of LiL_i. Write EndFuk(iLi)\operatorname{End}_{\operatorname{Fuk}}(\bigoplus_iL_i) for the endomorphism algebra in the infinitesimally wrapped Fukaya category and EndW(iCi)\operatorname{End}_{\mathcal W}(\bigoplus_iC_i) for that in the partially wrapped Fukaya category.

Core--cocore Koszul duality conjecture.

EndFuk(iLi)andEndW(iCi)\operatorname{End}_{\operatorname{Fuk}}\left(\bigoplus_iL_i\right)\quad\text{and}\quad \operatorname{End}_{\mathcal W}\left(\bigoplus_iC_i\right)

are Koszul dual, expressing a duality between the core (skeleton) and the cocore, or linking disk.

The source explicitly calls this a false conjecture, so the statement is refuted as written. The surrounding discussion presents it as a naive version of the core--cocore philosophy rather than a valid general theorem.

Sources & referencesView supporting material

Primary source

Tatsuki Kuwagaki and Takahiro Saito, “Hodge microsheaves on cotangent bundles and plumbings”, arXiv:2502.04148 (2025).

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