محاضره 2

Functions and Their Graphs DEFINITION Function A function from a set D to a set Y is a rule that assigns a unique (single) element ƒ(x) ? Y to each element x ? D. A symbolic way to say “y is a function of x” is by writing y = ƒ(x) (“y equals ƒ of x”)
The set D of all possible input values is called the domain of the function. The set of all values of ƒ(x) as x varies throughout D is called the range of the function. The range may not include every element in the set Y.Functions and Their Graphs DEFINITION Function A function from a set D to a set Y is a rule that assigns a unique (single) element ƒ(x) ? Y to each element x ? D. A symbolic way to say “y is a function of x” is by writing y = ƒ(x) (“y equals ƒ of x”)
The set D of all possible input values is called the domain of the function. The set of all values of ƒ(x) as x varies throughout D is called the range of the function. The range may not include every element in the set Y.Functions and Their Graphs DEFINITION Function A function from a set D to a set Y is a rule that assigns a unique (single) element ƒ(x) ? Y to each element x ? D. A symbolic way to say “y is a function of x” is by writing y = ƒ(x) (“y equals ƒ of x”)
The set D of all possible input values is called the domain of the function. The set of all values of ƒ(x) as x varies throughout D is called the range of the function. The range may not include every element in the set Y.