English
If a ≠ 0 and p is irreducible and p divides a, then the class of p appears among the factors of the class of a.
Русский
Если a ≠ 0 и p неприводимо и p делит a, то класс p входит в множество факторов класса a.
LaTeX
$$$$a \\neq 0 \\land \\mathrm{Irreducible}(p) \\land p \\mid a \\Rightarrow \\mathrm{Associates.mk}p \\in \\mathrm{factors}\\, (\\mathrm{Associates.mk}a).$$$$
Lean4
theorem mem_factors_of_dvd {a p : α} (ha0 : a ≠ 0) (hp : Irreducible p) (hd : p ∣ a) :
Associates.mk p ∈ factors (Associates.mk a) :=
by
rw [factors_mk _ ha0]
exact mem_factorSet_some.mpr (mem_factors'_of_dvd ha0 hp hd)