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`BookProof.ChapterSphericalBessel.deriv_sbesselBase` {r : ℝ} (hr : r ≠ 0) : deriv sbesselBase r = Real.cos r / r - Real.sin r / r ^ 2

Proved
BookProof.ChapterSphericalBessel.deriv_sbesselBase

by leonardopedro · Oct 10, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterSphericalBessel.

BookProof.ChapterSphericalBessel.deriv_sbesselBase {r : ℝ} (hr : r ≠ 0) : deriv sbesselBase r = Real.cos r / r - Real.sin r / r ^ 2

Formalization note: Lean 4 identifier BookProof.ChapterSphericalBessel.deriv_sbesselBase.

Preamble
-- Generated from ChapterSphericalBessel.lean — theorem BookProof.ChapterSphericalBessel.deriv_sbesselBase
import Mathlib
import Definitions.Def_ChapterSphericalBessel
open BookProof.ChapterSphericalBessel



open scoped Topology
Formal statement
theorem BookProof.ChapterSphericalBessel.deriv_sbesselBase {r : ℝ} (hr : r ≠ 0) :
    deriv sbesselBase r = Real.cos r / r - Real.sin r / r ^ 2 := by sorry

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