English
The matrix of the left-composed bilinear form equals the transpose of the matrix of f multiplied by the matrix of B.
Русский
Матрица левой композиции билинейной формы равна транспонированной матрице f, умноженной на матрицу B.
LaTeX
$$BilinForm.toMatrix b (B.compLeft f) = (LinearMap.toMatrix b b f)^T * BilinForm.toMatrix b B$$
Lean4
theorem toMatrix_compLeft (B : BilinForm R₁ M₁) (f : M₁ →ₗ[R₁] M₁) :
BilinForm.toMatrix b (B.compLeft f) = (LinearMap.toMatrix b b f)ᵀ * BilinForm.toMatrix b B :=
LinearMap.toMatrix₂_comp _ _ _ B _