English
For I a polynomial ideal, the equation describing the zero of a certain evaluation map implies the zero of the constant.
Русский
Для I — идеал полиномов, равносильное равенство нулю отображения оценки приводит к нулю константы.
LaTeX
$$$\\forall I:\\, I\\text{ in } R[X] \\Rightarrow (\\text{eq zero after map})$$$
Lean4
theorem quotient_map_C_eq_zero {I : Ideal R} {i : R} (hi : i ∈ I) :
(Ideal.Quotient.mk (Ideal.map (C : R →+* MvPolynomial σ R) I : Ideal (MvPolynomial σ R))).comp C i = 0 :=
by
simp only [Function.comp_apply, RingHom.coe_comp, Ideal.Quotient.eq_zero_iff_mem]
exact Ideal.mem_map_of_mem _ hi