Perry County is also a part of the larger Harrisburg-York-Lebanon, PA Combined Statistical Area (CSA), which combines the populations of Perry County as well as Adams, Cumberland, Dauphin, Lebanon and York Counties in Pennsylvania.
In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2.
The definition of a function [math]f(x)[/math] having the limit [math]\lim_{x\to\infty} f(x) = L[/math] is if, for every [math]\epsilon[/math], there is an [math]N[/math] such that for every [math]x>N[/math], you have [math]|f(x) - L| < \epsilon[/math].