Notes for AKT-170217/0:03:07

[math]\displaystyle{ g_0 }[/math] may be the 0th in the class of Lie algebras we're playing with but its enveloping algebra can be made simpler still. Consider the algebra H obtained from [math]\displaystyle{ U(g_0) }[/math] by inverting h and quotienting by the relation [math]\displaystyle{ l=-ef/h }[/math] (check that [math]\displaystyle{ l+ef/h }[/math] is a central element in [math]\displaystyle{ U(g_0) }[/math]). And while we're at it, why not scale out the h entirely? Also, the screen is impossible to see on video but the accompanying mathematica file makes up for it twice. Roland