English
If p is a prime element in a commutative ring, then −p is also prime.
Русский
Если p — простой элемент в коммутативном кольце, то −p также прост.
LaTeX
$$$\forall p\, (Prime(p) \rightarrow Prime(-p))$$$
Lean4
theorem neg {p : α} (hp : Prime p) : Prime (-p) :=
by
obtain ⟨h1, h2, h3⟩ := hp
exact ⟨neg_ne_zero.mpr h1, by rwa [IsUnit.neg_iff], by simpa [neg_dvd] using h3⟩