English
In a distributive lattice with a bounded order, membership in the sum of an ideal J and a principal ideal ⟨a⟩ can be characterized by the existence of j ∈ J with b ≤ j ∨ a.
Русский
В распределяемой решётке с ограничением членство в суммае J ⊔ ⟨a⟩ эквивалентно существованию j ∈ J с b ≤ j ∨ a.
LaTeX
$$$b \\in J \\lor \\text{principal } a \\text{ implies } b \\le j \\vee a$ for some j ∈ J$$
Lean4
theorem _root_.Order.Ideal.PrimePair.F_isPrime (IF : Ideal.PrimePair P) : IsPrime IF.F :=
{
compl_ideal := by
rw [IF.compl_F_eq_I]
exact IF.I.isIdeal }