Remark 2
Tag 00Y4, permanent. Cite it as [Bourbaki, Tag 00Y4].
Lie Groups and Lie Algebras, chapter VIII, § 1. The Lie algebra sl(2, k) and its representations
For and ,
Hence, is the basis of associated to the primitive element .
Bourbaki sets the proof directly after the statement, and the corpus does not separate them, so what is above is the statement and its proof together.
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