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.
arXiv preprint (2014), arXiv preprint (2014)
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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.