Compatible-extraction conjecture for zero mutable Laurent polynomials

Let X0X_0 be an affine Gorenstein toric 33-fold defined by the cone over a polygon \triangle at height 11. For each edge ee of \triangle, let (e)\ell(e) be its lattice length. A zero mutable Laurent polynomial ff determines a decreasing partition divstepe(f)\mathbf{divstep}_e(f) of (e)\ell(e), and write divstepe(f)\mathbf{divstep}_e(f)^\vee for its dual partition. Let Xi\cup X_i be the toric degeneration associated with the central subdivision, and let CijXiXjC_{ij}\subset X_i\cap X_j be the associated curves.

Compatible-extraction conjecture. If the partitions (pe)e(\mathbf p_e)_e are given by divstepe(f)\mathbf{divstep}_e(f)^\vee, then there exists a compatible collection YiXiY_i\to X_i of divisorial extractions of CijXi\cup C_{ij}\subset\cup X_i.

Such a collection is the first step in constructing a log crepant log resolution and, ultimately, a smoothing of X0X_0. The paper proves this conjecture for the families called Tom, Jerry and Tyke, while the Spike cases are left as a conjectural part of the proposed method.

Sources & referencesView supporting material

Primary source

Tim Gräfnitz, “Smoothings from zero mutable Laurent polynomials via log resolutions and divisorial extractions”, arXiv:2503.18661 (2025).

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