# Set Definition by Predicate/Examples/Set Indexed by Natural Numbers between 1 and 10

Let $U$ be the set defined as:
$U := \set {u_i: 1 < i < 10, i \in \N}$
Then $U$ has exactly $8$ elements:
$U = \set {u_2, u_3, u_4, u_5, u_6, u_7, u_8, u_9}$