The conjecture on TF-equivalence classes and cones of g-vectors

Let Λ\Lambda be a finite-dimensional algebra, let K0(projΛ)RK_0(\operatorname{proj}\Lambda)_{\mathbb{R}} be its real Grothendieck group, and let gg be a g-vector. Write [g]TF[g]_{\operatorname{TF}}^{\circ} for the interior of the TF\operatorname{TF}-equivalence class of gg, and let ind(Ng)\operatorname{ind}(\mathbb{N}g) denote the set of indices associated with the nonnegative integer multiples of gg. For a set of vectors, write Cone\operatorname{Cone}^{\circ} for the relative open cone that they generate. The conjecture. One has

[g]TF=Cone{ind(Ng)}.[g]_{\operatorname{TF}}^{\circ}=\operatorname{Cone}^{\circ}\{\operatorname{ind}(\mathbb{N}g)\}.

This is a modified version of a conjecture of Asai and Iyama concerning TF\operatorname{TF}-equivalence classes and generic decompositions of g-vectors. The equality is known under additional hypotheses such as EE-tameness or heredity, while the general case remains open.

Sources & referencesView supporting material

Primary source

Mohamad Haerizadeh and Siamak Yassemi, “The cones of g-vectors”, arXiv:2501.15822 (2026).

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