English
Under a field extension K ⊆ L, restricting scalars preserves the IsPerfPair property for the restricted bilinear form.
Русский
При расширении поля K ⊆ L ограничение скаляров сохраняет свойство IsPerfPair для ограниченной билинейной формы.
LaTeX
$$restrictScalars_of_field : IsPerfPair$$
Lean4
theorem ker_pi (f : (i : ι) → M₂ →ₗ[R] φ i) : ker (pi f) = ⨅ i : ι, ker (f i) := by ext c; simp [funext_iff]