Carlos R. Videla2026-03-222026-03-221988https://andeanlibrary.org/handle/123456789/60491Let Σ be a root system. ∆ ⊏ Σ a base and Σ + the set of positive roots. We prove the following two propositions. Theorem [Formula Matematica].enRoot (linguistics)MathematicsBase (topology)Set (abstract data type)Calculus (dental)article