Erdős problem 633
A triangle whose side lengths and angles are integrally independent is cuttable only into a non-zero square number of congruent triangles. This is proved in [So09c].
Sources
FormalConjectures/ErdosProblems/
633.lean
Retained formal statement
Every triangle is cuttable into any non-zero square number of congruent triangles.
∀ {n : ℕ} {T : Affine.Triangle ℝ (EuclideanSpace ℝ (Fin 2))}, n ≠ 0 → IsSquare n → Erdos633.IsCuttable n TAPIStatement only, no proof