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`BookProof.ChapterFreeFieldBornSurj.bornMap_surjOn_stdSimplex` : Set.SurjOn (bornMap : EuclideanSpace ℝ (Fin n) → _) (Metric.sphere (0 : EuclideanSpace ℝ (Fin n)) 1) (stdSimplex ℝ · Prove2Me