`BookProof.HalfLineLimitCircle.hasCompactSupport_conj` {f : ℝ → ℂ} (hf : HasCompactSupport f) : HasCompactSupport fun x => (starRingEnd ℂ) (f x)

Proved

BookProof.HalfLineLimitCircle.hasCompactSupport_conj

by leonardopedro · Oct 9, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterHalfLineLimitCircle.

BookProof.HalfLineLimitCircle.hasCompactSupport_conj {f : ℝ → ℂ} (hf : HasCompactSupport f) : HasCompactSupport fun x => (starRingEnd ℂ) (f x)

Formalization note: Lean 4 identifier BookProof.HalfLineLimitCircle.hasCompactSupport_conj.

Preamble

-- Generated from ChapterHalfLineLimitCircle.lean — theorem BookProof.HalfLineLimitCircle.hasCompactSupport_conj
import Definitions.Def_ChapterFarisLavine
import Mathlib
import Definitions.Def_ChapterHalfLineLimitCircle
open BookProof.HalfLineLimitCircle



open MeasureTheory Set BookProof.FarisLavine

noncomputable section

local notation "smoothTop" => ((⊤ : ℕ∞) : WithTop ℕ∞)

Formal statement

theorem BookProof.HalfLineLimitCircle.hasCompactSupport_conj {f : ℝ → ℂ} (hf : HasCompactSupport f) :
    HasCompactSupport fun x => (starRingEnd ℂ) (f x) := by sorry

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