Definition:Descending Chain Condition

Definition
Let $A$ be a commutative ring with unity.

Let $M$ be an $A$-module.

Let $(D,\supseteq)$ be a set of submodules of $M$ ordered by "containation".

Then the hypothesis


 * Every increasing sequence $N_1 \supseteq N_2 \supseteq N_3 \supseteq \cdots$ with $N_i \in D$ eventually terminates: there is $k \in \N$ such that $N_k = N_{k+1} = \cdots$

is called the descending chain condition on the submodules in $D$.