English
In a nontrivial ring, the height of the bottom ideal is zero.
Русский
В несобственном кольце высота нулевого идеала равна нулю.
LaTeX
$$$\operatorname{height}(\perp) = 0.$$$
Lean4
@[simp]
theorem height_bot [Nontrivial R] : (⊥ : Ideal R).height = 0 :=
by
obtain ⟨p, hp⟩ := Ideal.nonempty_minimalPrimes (R := R) (I := ⊥) top_ne_bot.symm
simp only [Ideal.height, ENat.iInf_eq_zero]
exact
⟨p, hp,
haveI := hp.1.1;
primeHeight_eq_zero_iff.mpr hp⟩