Bourbaki

Remark 3

Tag 0CO8, permanent. Cite it as [Bourbaki, Tag 0CO8].

Commutative Algebra, chapter VIII, § 4. Séries de Hilbert-Samuel

Let M(p)M(p) be the module deduced from M by shifting the grading by pp (A, II, p. 165, example 3). Since we have M(p)n=Mp+nM(p)_n = M_{p+n}, we have PM(p)=T−pPMP_{M(p)} = T^{-p}P_M, QM(p)=T−pQMQ_{M(p)} = T^{-p}Q_M and cM(p)=cMc_{M(p)} = c_M.

Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.

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