Non-full exactness conjecture for vector spaces over general small quantum groups

From papers

Let C\mathcal{C} be the braided tensor category of finite-dimensional modules over uq(g)u_q(\mathfrak{g}), where qq is a root of unity of odd order and the category is equipped with the standard factorizable R-matrix. Let vect\mathbf{vect} be the canonical C\mathcal{C}-module category. Non-full exactness conjecture. The C\mathcal{C}-module category vect\mathbf{vect} is not fully exact. This generalizes the proposition established for uq(sl2)u_q(\mathfrak{sl}_2); the claim for general g\mathfrak{g} remains open.

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Sources & referencesView supporting material

Primary source

Azat M. Gainutdinov and Robert Laugwitz, “Fully exact and fully dualizable module categories”, arXiv:2601.22017 (2026).

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