Definition:Geometric Sequence/Scale Factor

Definition
Let $\sequence {x_n}$ be a geometric sequence in $\R$ defined as:
 * $x_n = a r^n$ for $n = 0, 1, 2, 3, \ldots$

The parameter:
 * $a \in \R: a \ne 0$

is called the scale factor of $\sequence {x_n}$.