The naive-algebra presentation conjecture for Fukaya Hall composition subalgebras

Let (S,M)(S,M) be a graded marked surface with a full arc system AA, and suppose that (S,M)(S,M) has enough marked intervals, meaning that for each disk (Dk2,Mk)(D_k^2,M_k) in the decomposition induced by AA, the inclusion otak:(Dk2,Mk)(S,M)ota_k:(D_k^2,M_k)\to(S,M) is injective on connected components. Let n(S,A)\mathbf{n}(S,A) be the naive algebra obtained by gluing the disk algebras, let Alg(S,A)\operatorname{Alg}(S,A) be the composition subalgebra, and let

γ:n(S,A)Alg(S,A)\gamma:\mathbf{n}(S,A)\twoheadrightarrow\operatorname{Alg}(S,A)

be the surjective homomorphism induced by sending each arc generator to the corresponding arc. Naive-algebra presentation conjecture. If (S,M)(S,M) has enough marked intervals, then γ\gamma is an algebra isomorphism. The map is known to be an isomorphism when SS is a disk, while the assertion for general marked surfaces with enough marked intervals remains conjectural.

Sources & referencesView supporting material

Primary source

Benjamin Cooper and Peter Samuelson, “The Hall Algebras of Surfaces I”, arXiv:1708.00889 (2017).

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