English
Let B be a bilinear form represented by a matrix M in a basis b. The form is left-nondegenerate if and only if the matrix M is nondegenerate.
Русский
Пусть B — билинейная форма на модуле, представленная матрицей M в базисе b. Тогда форма слева-разделяющая тождественно невырождена тогда и только тогда, когда матрица M невырождена.
LaTeX
$$$ (toLinearMap_2 b b M).SeparatingLeft \iff M \text{ is nondegenerate}$$$
Lean4
@[simp]
theorem _root_.Matrix.separatingLeft_toLinearMap₂_iff {M : Matrix ι ι R₁} (b : Basis ι R₁ M₁) :
(toLinearMap₂ b b M).SeparatingLeft ↔ M.Nondegenerate := by
rw [← Matrix.separatingLeft_toLinearMap₂'_iff_separatingLeft_toLinearMap₂, Matrix.separatingLeft_toLinearMap₂'_iff]
-- Lemmas transferring nondegeneracy between a bilinear form and its associated matrix