A complete, axiom-free Lean 4 formalization of combinatorial curve neighborhoods for A1(1) has been achieved by encoding them as maximal vertices in degree-bounded reachable sets of the infinite dihedral moment graph.
Journal of Differential Geometry99(2), 255–283 (2015) 8 Yihe Huang, Sizhe Cui, Jiaqi Wang, and Jujian Zhang
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Formalizing $A_1^{(1)}$ Curve Neighborhoods in Lean 4
A complete, axiom-free Lean 4 formalization of combinatorial curve neighborhoods for A1(1) has been achieved by encoding them as maximal vertices in degree-bounded reachable sets of the infinite dihedral moment graph.