- 4.1: Piecewise-Defined Functions
- In preparation for the definition of the absolute value function, it is extremely important to have a good grasp of the concept of a piecewise-defined function.
- 4.2: Absolute Value
- The absolute value of a number is a measure of its magnitude, sans (without) its sign.
Thumbnail: The graph of the absolute value function for real numbers. Image used with permission (CC BY-SA 3.0; Qef and Ævar Arnfjörð Bjarmason via Wikipedia).