mathlib

d62a4614 - feat(linear_algebra/determinant): `det (M ⬝ N) = det (N ⬝ M)` if `M` is invertible (#8720)

feat(linear_algebra/determinant): `det (M ⬝ N) = det (N ⬝ M)` if `M` is invertible (#8720) If `M` is a square or invertible matrix, then `det (M ⬝ N) = det (N ⬝ M)`. This is basically just using `mul_comm` on `det M * det N`, except for some tricky rewriting to handle the invertible case. Co-authored-by: Anne Baanen <Vierkantor@users.noreply.github.com>