The Lean 4 theorem `fiberSumHam_symmetricOn` in the `ChapterBddBelowFiberSumEsa` chapter of the timepiece formalization

-- Generated from ChapterBddBelowFiberSumEsa.lean — theorem BookProof.BddBelowFiberSumEsa.fiberSumHam_symmetricOn
import Mathlib
import Definitions.Def_ChapterBddBelowFiberSumEsa
open BookProof.BddBelowFiberSumEsa











open MeasureTheory
open BookProof.FarisLavine BookProof.ScalaronEsa BookProof.ScalaronWallEsa

noncomputable section

variable {ι : Type*}

theorem BookProof.BddBelowFiberSumEsa.fiberSumHam_symmetricOn (V : ι → ℝ → ℝ)
    (hV : ∀ i, ContDiff ℝ ((⊤ : ℕ∞) : WithTop ℕ∞) (V i)) :
    SymmetricOn (fiberCore ι) (fiberSumHam V hV) := by sorry