English
A variant of the previous count equality under strengthened hypotheses, linking span counts to normalized factors.
Русский
Вариант предыдущего равенства счётов при усиленных допущениях связывает счёт спана и нормализованных факторов.
LaTeX
$$Multiset.count (Ideal.span { X }) (normalizedFactors (Ideal.span { r })) = Multiset.count (normalize X) (normalizedFactors r)$$
Lean4
/-- The finite set of all prime factors of the pushforward of `p`. -/
noncomputable abbrev primesOverFinset {A : Type*} [CommRing A] (p : Ideal A) (B : Type*) [CommRing B]
[IsDedekindDomain B] [Algebra A B] : Finset (Ideal B) :=
(factors (p.map (algebraMap A B))).toFinset