Ideals Containing Ideal Form Lattice

Theorem
Let $J$ be an ideal of a ring $R$.

Let $\mathbb L_J$ be the set of all ideals of $R$ which contain $J$.

Then the ordered set $\struct {\mathbb L_J, \subseteq}$ is a lattice.

Proof
Let $b_1, b_2 \in \mathbb L_J$.

Then from Set of Ideals forms Complete Lattice:


 * $(1): \quad b_1 + b_2 \in \mathbb L_J$ and is the supremum of $\set {b_1, b_2}$
 * $(2): \quad b_1 \cap b_2 \in \mathbb L_J$ and is the infimum of $\set {b_1, b_2}$

Thus $\struct {\mathbb L_J, \subseteq}$ is a lattice.