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## 15.5 Outline

- Definitions
- first/second components
- function

- Representations of functions
- ordered pairs
- mapping
- machine

- Functional notation
- domain
- range
- difference quotient

- Vertical line test
- Some important functions (see below)
- constant function
- linear function
- quadratic function
- trigonometric function
- exponential function
- logarithmic function
- probability

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