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Joint reductions and Rees algebras

Published online by Cambridge University Press:  24 October 2008

J. K. Verma
Affiliation:
Department of Mathematics, Indian Institute of Technology, Powai, Bombay 400 076, India

Extract

Let R be a Cohen-Macaulay local ring of dimension d, multiplicity e and embedding dimension v. Abhyankar [1] showed that vd + 1 ≤ e. When equality holds, R is said to have minimal multiplicity. The purpose of this paper is to study the preservation of this property under the formation of Rees algebras of several ideals in a 2-dimensional Cohen-Macaulay (CM for short) local ring. Our main tool is the theory of joint reductions and mixed multiplicities developed by Rees [9] and Teissier[12].

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1991

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References

REFERENCES

[1]Abhyankar, S. S.. Local rings of high embedding dimension. Amer. J. Math. 89 (1967), 10731077.CrossRefGoogle Scholar
[2]Goto, S. and Shimoda, Y.. On the Rees algebra of Cohen-Macaulay local rings. In Commutative Algebra (Analytic Methods), Lecture Notes in Pure and Applied Math., vol. 68 (Marcel Dekker, 1982), pp. 201231.Google Scholar
[3]Huneke, C.. Hilbert functions and symbolic powers. Michigan Math. J. 34 (1987), 293318.CrossRefGoogle Scholar
[4]Huneke, C. and Sally, J.. Birational extensions in dimension two and integrally closed ideals. J. Algebra 115 (1988), 481500.CrossRefGoogle Scholar
[5]Lipman, J.. Rational singularities with applications to algebraic surfaces and unique factorization. Inst. Hautes Études Sci. Publ. Math. 36 (1969), 195279.CrossRefGoogle Scholar
[6]Matsumura, H.. Commutative Ring Theory (Cambridge University Press, 1987).CrossRefGoogle Scholar
[7]Northcott, D. G. and Rees, D.. Reductions of ideals in local rings. Proc. Cambridge Philos Soc. 50 (1954), 145158.CrossRefGoogle Scholar
[8]Rees, D.. Hilbert functions and pseudo-rational local rings of dimension 2. J. London Math. Soc. (2) 24 (1981), 467479.CrossRefGoogle Scholar
[9]Rees, D.. Generalizations of reductions and mixed multiplicities. J. London Math. Soc. (2) 29 (1984), 397414.CrossRefGoogle Scholar
[10]Rees, D.. Degree functions in local rings. Proc. Cambridge Philos. Soc. 57 (1961), 17.CrossRefGoogle Scholar
[11]Sally, J. D.. On the associated graded ring of a local Cohen–Macaulay ring. J. Math. Kyoto Univ. 17 (1977), 1921.Google Scholar
[12]Teissier, B.. Cycles évanescents, sections planes, et conditions de Whitney, singularités à Cargesé 1972. Astérisque 7–8 (1973), 285362.Google Scholar
[13]Verma, J. K.. Rees algebras with minimal multiplicity. Comm. Algebra 17 (1989), 29993024.CrossRefGoogle Scholar
[14]Verma, J. K.. Joint reductions of complete ideals. Nagoya Math. J. 118 (1990), 155163.CrossRefGoogle Scholar
[15]Verma, J. K.. Rees algebras and mixed multiplicities. Proc. Amer. Math. Soc. 104 (1988), 10361044.CrossRefGoogle Scholar