English
The submodules of M form a complete lattice under inclusion, with join given by the sum and meet by intersection.
Русский
Подмодули M образуют полную решетку по включению; сумма даёт объединение, пересечение — пересечение.
LaTeX
$$$\mathrm{Submodule}_R(M)$ is a complete lattice with join $p \vee q = p + q$ and meet $p \wedge q = p \cap q$.$$
Lean4
instance : InfSet (Submodule R M) :=
⟨fun S ↦
{ carrier := ⋂ s ∈ S, (s : Set M)
zero_mem' := by simp [zero_mem]
add_mem' := by simp +contextual [add_mem]
smul_mem' := by simp +contextual [smul_mem] }⟩