Definition:Smaller Set

Definition
Let $S$ and $T$ be sets.

Also known as
If $S$ is smaller than $T$, then $S$ is said to be of lower cardinality or smaller cardinality than $T$.

Also see

 * Equivalence of Definitions of Smaller Set


 * Definition:Strictly Smaller Set


 * Definition:Larger Set
 * Definition:Strictly Larger Set