### Section 4.2 Materials

Section 4.2 Basic Comprehension Quiz

### Section 4.2 Screencasts

Please note that if you are having buffering issues or slow response times for the videos or video controls, this can be alleviated by downloading the video. There is a "Download" button below the viewing screen of each video.

### Section 4.2 Supplemental Videos

Here is a selection of supplemental videos related to topics in this section.

- Injective functions (Screencast 6.3.1),
- How to prove a function is an injection (Screencast 6.3.2),
- Surjective functions (Screencast 6.3.3),
- How to prove that a function is a surjection (Screencast 6.3.4)

These videos were created by Robert Talbert from the Mathematics Department at Grand Valley State University. Click here for more details.