Subset/Examples/Abstract Example 2

Example of Subset
Let $A$ denote the set:
 * $A := \set {\dfrac 1 2, 1, \sqrt 2, e, \pi}$

Let $C$ denote the set:
 * $C := \set {x \in \R: x > 0}$

Then:
 * $A \subseteq C$