`BookProof.ChapterA3r.trace_projSym_two` : Matrix.trace (projSym 2) = 10

Proved

BookProof.ChapterA3r.trace_projSym_two

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterA3r.

BookProof.ChapterA3r.trace_projSym_two : Matrix.trace (projSym 2) = 10

Formalization note: Lean 4 identifier BookProof.ChapterA3r.trace_projSym_two.

Preamble

-- Generated from ChapterA3r.lean — theorem BookProof.ChapterA3r.trace_projSym_two
import Definitions.Def_ChapterA3o
import Definitions.Def_ChapterA3q
import Mathlib
import Definitions.Def_ChapterA3r
import Definitions.Def_ChapterA3l
import Definitions.Def_ChapterA3n
open BookProof.ChapterA3l
open BookProof.ChapterA3n
open BookProof.ChapterA3r


open Matrix
open scoped BigOperators


open BookProof.ChapterA3n BookProof.ChapterA3o BookProof.ChapterA3q

Formal statement

theorem BookProof.ChapterA3r.trace_projSym_two : Matrix.trace (projSym 2) = 10 := by sorry

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