Abstract Algebra | Subgroups and quotient groups of the quaternions.

We present a description of all subgroups and quotient groups of the quaternions.

[tracyh]

6:03 I can't tell if Michael did the misfired snapping gag on purpose, or if he forgot to edit out the erasing footage. Either way I love it.

[hyperduality]

Subspace topology is dual to quotient topology.
Clockwise is dual to anti-clockwise.
"Always two there are" -- Yoda.

[MrWinter]

You make my abstract class seem lacking! Thank you; you're a big part of my success in my university class!