2004
DOI: 10.1007/s00229-004-0492-7
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Arithmetic degree and associated graded modules

Abstract: Abstract1 We prove that the arithmetic degree of a graded or local ring A is bounded above by the arithmetic degree of any of its associated graded rings with respect to ideals I in A. In particular, if Spec(A) is equidimensional and has an embedded component (i.e., A has an embedded associated prime ideal), then the normal cone of Spec(A) along V(I) has an embedded component too. This extends a result of W. M. Ruppert about embedded components of the tangent cone.

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“…Some (consider the case of the I-adic filtration) occur simply by considering the passage R → R[It, t −1 ] followed by the hyperplane section t −1 . Other detailed information is found by a direct analysis (see [204]).…”
Section: Proof Consider the Exact Sequences Induced By Multiplication Bymentioning
confidence: 99%
“…Some (consider the case of the I-adic filtration) occur simply by considering the passage R → R[It, t −1 ] followed by the hyperplane section t −1 . Other detailed information is found by a direct analysis (see [204]).…”
Section: Proof Consider the Exact Sequences Induced By Multiplication Bymentioning
confidence: 99%