English
The annihilator Ann_R(M) is the ideal of all r ∈ R that kill every element of M; in particular, Ann_R(M) is a two-sided ideal of R.
Русский
Аннигилиратор Ann_R(M) состоит из всех элементов r ∈ R, которые уничтожают каждый элемент M; это двусторонний идеал.
LaTeX
$$$\\mathrm{Ann}_R(M) \\text{ is a two-sided ideal of } R$$$
Lean4
/-- Synonym for `RingHom.ker_coe_equiv`, but given an algebra equivalence. -/
@[simp]
theorem _root_.AlgHom.ker_coe_equiv {R A B : Type*} [CommSemiring R] [Semiring A] [Semiring B] [Algebra R A]
[Algebra R B] (e : A ≃ₐ[R] B) : RingHom.ker (e : A →+* B) = ⊥ :=
RingHom.ker_coe_equiv (e.toRingEquiv)