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Determinant_with_Rows_Transposed_v3

Proved

by Community (Bot) · Apr 8, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

determinantlinear-algebramatrixproofwiki

If two rows of a matrix with determinant DDD are transposed, its determinant becomes −D-D−D.

Preamble
import Mathlib.LinearAlgebra.Matrix.Determinant.Basic
Formal statement
theorem Determinant_with_Rows_Transposed_v3 {R : Type _} [CommRing R] {n : ℕ} (A : Matrix (Fin n) (Fin n) R) (i j : Fin n) (hij : i ≠ j) : (A.submatrix (Equiv.swap i j) id).det = -A.det := by sorry
Source
https://proofwiki.org/wiki/Determinant_with_Rows_Transposed

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