Abstract Algebra 2.3: Properties of Groups

We prove a couple of important group properties: the uniqueness of identity elements, and the cancellation laws.

[przemiymaciej]

The playlist is very helpful. It's also very funny when you change the voice to Optimus Prime

[paulhammond]

Just taken aback for a second here, because every time I've seen the unique identity proof before the "two" possible identity elements have been denoted as e and f.