Lie groups and Lie algebras: Invariant theory (optional extra video)

We discuss in detail how to view the space of binary quadratic forms as a representation of SL(2,C) and why b^2 - 4ac is an invariant. This relies on the earlier video jde27.uk/lgla/28_plethysm.html and corrects a mistake in an earlier version of that video.

[@josvanderspek1403]

I see the notion of decomposing into a nilpotent part, but I never really seem to have grasped that. I know that's a deep fact though, and I'd like to hear it come into your comments into your future videos. Oh, and I hope there will be future videos :p