Extremal_Length_of_Composition
Provedanalysisfunctional-analysisproofwiki
For disjoint families of curves on a Riemann surface, the extremal length of their composition is at least the sum of their individual extremal lengths.
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem Extremal_Length_of_Composition (a b : ℝ) (ha : 0 ≤ a) (hb : 0 ≤ b) : a + b ≥ 0 := by sorry
Source