Hostname: page-component-8448b6f56d-qsmjn Total loading time: 0 Render date: 2024-04-18T01:36:16.942Z Has data issue: false hasContentIssue false

A note on form rings and ideals

Published online by Cambridge University Press:  26 February 2010

D. Rees
Affiliation:
Downing College, Cambridge.
Get access

Extract

Let Q be a local ring and let q be an m-primary ideal of Q, where m is the maximal ideal of Q. With q we may associate a ring F(Q, q), termed the form ring of Q relative to the ideal q. If u1, …, um is a basis of q, and if B denotes the quotient ring Q/q, there is a homomorphism of the ring B[X1, …, Xm] of polynomials over B in indeterminates X1 …, Xm onto F(Q, q). The kernel of this homomorphism is a homogeneous ideal of B[X1 …, Xm]. Finally, if a is an ideal of Q there is a homomorphism of F(Q, q) onto F(Q/a, q+a/a). The kernel of this latter homomorphism will be termed the form ideal relative to q of a and denoted by ā.

Type
Research Article
Copyright
Copyright © University College London 1957

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Chevalley, C., “Intersections of algebraic and algebroid varieties”, Trans. American Math. Soc, 57 (1945), 185.CrossRefGoogle Scholar
2.Krull, W., “Dimensionstheorie in Stellenringen”, J. reine angew. Math., 179 (1938), 204226.CrossRefGoogle Scholar
3.Lech, C., “On the associativity formula for multiplicities”, Arkiv för Math. 3 (1956), 301314.CrossRefGoogle Scholar
4.Northcott, D. G., “A general theory of one-dimensional local rings”, Proc. Glasgow Math. Ass. 2 (1956), 159169.CrossRefGoogle Scholar
5.Northcott, D. G., “On the local cone of a point on an algebraic variety”, Journal London Math. Soc., 29 (1954), 326333.CrossRefGoogle Scholar
6.Northcott, D. G., “Hilbert's function in a local ring”, Quart. J. Math. Oxford (2), 4 (1953), 6780.CrossRefGoogle Scholar
7.Rees, D., “Valuations associated with ideals (II)”, Journal London Math. Soc., 31 (1956), 221227.CrossRefGoogle Scholar