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.
Mathematics. an abstraction of the property of length; a set function assigning to each set of a collection of sets a value, usually having the properties of sigma finiteness and fnite additivity, the functional value of the whole collection being greater than zero. verb (used with object), measured, measuring.