The closure of the minimal nilpotent orbit of E6 is shown to be isomorphic to the affinization of T^*(SL4/P^u), where P^u is the unipotent radical of a parabolic in SL4.
The minimal nilpotent orbit, the Joseph ideal, and differential operators
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Minimal Nilpotent Orbits of type D and E
The closure of the minimal nilpotent orbit of E6 is shown to be isomorphic to the affinization of T^*(SL4/P^u), where P^u is the unipotent radical of a parabolic in SL4.