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Unformatted text preview: Math 1650 Lecture Notes §2.1 Jason Snyder, PhD. What Is a Function? Page 1 of 6 § 2.1: What Is a Function Definition of Function A function is a rule. In order to talk about a function, we need to give it a name. We will use letters such as f, g, h, … to represent functions. For example, we may let f represent the following rule: f is the rule “square the number” When we write f (3), we means “apply the rule f to the number 3.” Applying the rule gives f (3) = 3 2 = 9. We will usually consider functions for which the set A and B are sets of real numbers. The symbol f (x) is rea d “ f of x” and is called the value of f at x . The set A is called the domain of f . The range of f if the set of all possible values of f ( x ) as x varies throughout the domain, in other words range of = ¡?¢ : ? ∈ £ . The symbol that represents an arbitrary number in the domain of a function is called an independent variable . The symbol that represents a number in the range is called a dependent variable...
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This note was uploaded on 10/07/2009 for the course MATH 150 taught by Professor Unknown during the Spring '06 term at Ohio State.
 Spring '06
 UNKNOWN
 Math

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