Bourbaki

Exercice 17, § 6

Tag 02FK, permanent. Cite it as [Bourbaki, Tag 02FK].

Théories spectrales, I, p. 182

Soient A une algèbre stellaire et x∈Ax\in A. Si x=a−bx=a-b avec a,ba, b positifs et ab=ba=0ab=ba= 0, alors a=x+a=x^+ et b=x−b=x^-.

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Transcribed from the printed volume. Not translated.