Bourbaki

Exercise 8, § 1

Tag 01JN, permanent. Cite it as [Bourbaki, Tag 01JN].

Lie Groups and Lie Algebras, VIII, 221

Show that the s\mathfrak{s}-module V(m)V(m) can be realized as the space of homogeneous polynomials f(u,v)f(u,v) of degree mm in two variables, the operators X+X_+, X−X_- and HH being given by:

X+f=u∂f∂v,X−f=−v∂f∂u,Hf=u∂f∂u−v∂f∂v. X_+f=u\frac{\partial f}{\partial v},\qquad X_-f=-v\frac{\partial f}{\partial u},\qquad Hf=u\frac{\partial f}{\partial u}-v\frac{\partial f}{\partial v}.
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