Functions and Their Types
A special kind of relation where every input has exactly one output.
What is a Function?
A function $f: A \to B$ is a relation where every element of $A$ is related to exactly one element of $B$.
Common Types of Functions
| Function | Rule |
|---|---|
| Identity | $f(x) = x$ |
| Constant | $f(x) = c$ |
| Polynomial | $f(x) = a_0 + a_1x + \dots + a_nx^n$ |
| Modulus | $f(x) = |x|$ |
Lesson 4 of 27