Bivariant web-and-forest and compatibility conjecture

Let SS be a marked bordered surface, and consider an SL3\operatorname{SL}_3 Fock--Goncharov cluster algebra associated with SS. A bi-web invariant is the invariant associated with an irreducible bivariant tensor diagram. A forest bivariant tensor diagram is a bivariant tensor diagram whose unclasping has no cycles.

Bivariant web conjecture. In any such cluster algebra: all cluster variables are bi-web invariants; a bi-web invariant is a cluster monomial if and only if it can also be written as a forest bivariant tensor diagram; and compatibility of cluster/coefficient variables is equivalent to their product being a single bi-web invariant.

This extends the preceding web and forest conjectures from ordinary webs to the bivariant Fock--Goncharov setting. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Sergey Fomin and Pavlo Pylyavskyy, “Webs on surfaces, rings of invariants, and clusters”, arXiv:1308.1718 (2013).

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