Definition:Little-O Notation/Sequence

Definition
Let $\left \langle {a_n} \right \rangle$ and $\left \langle {b_n} \right \rangle$ be sequences of real or complex numbers.

Definition 2
This is denoted
 * $a_n = o \left({b_n}\right)$

Also see

 * Equivalence of Definitions of Little-O Notation for Sequences