## Precalculus (6th Edition) Blitzer

Let us consider $a_1,a_2....a_n$ to be the function terms of a sequence. An infinite sequence is defined as a function whose domain is the set of positive integers. A finite sequence is defined as a function whose domain only consists of the first $n$ positive integers. For example: $7,10, 13,16, ....3n+4,....$