`BookProof.ChapterAbelianDiagonalCountable.diagOp_mul` (d e : EllInf) : diagOp (d * e) = (diagOp d).comp (diagOp e)

Proved

BookProof.ChapterAbelianDiagonalCountable.diagOp_mul

by leonardopedro · Oct 7, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterAbelianDiagonalCountable.

BookProof.ChapterAbelianDiagonalCountable.diagOp_mul (d e : EllInf) : diagOp (d * e) = (diagOp d).comp (diagOp e)

Formalization note: Lean 4 identifier BookProof.ChapterAbelianDiagonalCountable.diagOp_mul.

Preamble

-- Generated from ChapterAbelianDiagonalCountable.lean — theorem BookProof.ChapterAbelianDiagonalCountable.diagOp_mul
import Mathlib
import Definitions.Def_ChapterAbelianDiagonalCountable
open BookProof.ChapterAbelianDiagonalCountable


open scoped ENNReal

noncomputable section

Formal statement

theorem BookProof.ChapterAbelianDiagonalCountable.diagOp_mul (d e : EllInf) : diagOp (d * e) = (diagOp d).comp (diagOp e) := by sorry

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