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Noether-Lasker Theorem


The Noether-Lasker theorem states that for a commutative Noetherian ring R and a nonzero left unital R-module M that is a finitely generated module, there is a finite set of submodules {N_i:1<=i<=l} with the following properties (Altman and Kleiman 2013, pp. 109-110).

1.  intersection _(i=1)^lN_i=0, and  intersection _(i!=i_0)N_i is not contained in N_(i_0) for all 1<=i_0<=l.

2. Each quotient module M/N_i is nonzero and P_i-primary for some prime ideal P_i of R.

3. The prime ideals P_i are all distinct for 1<=i<=l.

4. If P_i does not contain P_j for any j!=i, then N_i is uniquely determined by M and P_i.

Here, P_i-primary means that every r in R acts on M/N_i either injectively or with some positive integer power acting as zero, and P_i is exactly the set of r satisfying the latter condition (Milne 2014, p. 90).


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References

Altman, A. and Kleiman, S. A Term of Commutative Algebra. Version of Sep. 1, 2013. https://web.mit.edu/18.705/www/13Ed.pdf.Milne, J. S. A Primer of Commutative Algebra. Version 4.01, Aug. 15, 2014. https://www.jmilne.org/math/xnotes/CA401.pdf.

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Noether-Lasker Theorem

Cite this as:

Weisstein, Eric W. "Noether-Lasker Theorem." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Noether-LaskerTheorem.html

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