Video on injective functions: https://youtu.be/0dSb30fE1so
In modular arithmetic, there are certain rules for canceling factors. This video is an explanation of those rules for canceling. Canceling mod n is very useful for more advanced ideas in modular arithmetic!
Modular Arithmetic playlist: https://www.youtube.com/playlist?list=PLug5ZIRrShJHPX-OyMNLLCQfKXchdZKpE
0:00 First Cancellation Rule
5:34 Second Cancellation Rule
7:42 Examples
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Music: OcularNebula - The Lopez