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dcposch/jc2-lean

Dan Clemens Posch

Palomar Registrypalomar/PALOMAR-2026-08-25-000002Aug 26, 2026math.AGscore 0

Lean 4 / Mathlib formalization of a two-sheet implication in the aligned nontrivial cubic-Kummer analysis at actual partial degrees (6,9). Every field-valued solution of the four lower-Pfaffian invariant equations is proved to lie on a common-power sheet with zero source bracket or on an elliptic sheet; converse inclusions and existence of the sheets are not compared. The formalization derives the elliptic equation and terminal one-form, excludes nonconstant reduced rational trajectories on its C != 0 fibre by a finite forbidden-value argument, factors the C=0 fibre, and verifies the shifted…

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