High School Functions
Domain Interpreting Functions
Cluster Understand the concept of a function and use function notation.
Standard Recognize that sequences are functions, sometimes defined recursively, whose domain is a subset of the integers. <span class='clarification'>For example, the Fibonacci sequence is defined recursively by $f(0) = f(1) = 1$, $f(n+1) = f(n) + f(n-1)$ for $n \ge 1$.</span>

F-IF.A.3. Recognize that sequences are functions, sometimes defined recursively, whose domain is a subset of the integers. For example, the Fibonacci sequence is defined recursively by $f(0) = f(1) = 1$, $f(n+1) = f(n) + f(n-1)$ for $n \ge 1$.