English
If R is nontrivial and M ⊆ nonZeroDivisors(R), then for every x ∈ S, the denominator component of the sec representation of x is nonzero in R.
Русский
Пусть R не тривиально и M ⊆ nonZeroDivisors(R). Тогда для каждого x ∈ S знаменатель сек представления x не нулевой в R.
LaTeX
$$$[\\text{Nontrivial } R]\\ (hM : M \\leq nonZeroDivisors\\ R)\\ \\forall x:\\, S,\\ ((\\mathrm{sec}\\ M\\ x).\\mathrm{snd} : R) \\neq 0$$$
Lean4
protected theorem to_map_ne_zero_of_mem_nonZeroDivisors [Nontrivial R] (hM : M ≤ nonZeroDivisors R) {x : R}
(hx : x ∈ nonZeroDivisors R) : algebraMap R S x ≠ 0 :=
by
rw [Ne, to_map_eq_zero_iff S hM]
exact nonZeroDivisors.ne_zero hx