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Acta Mathematica Vietnamica

Bockstein Cohomology of Associated Graded Rings

icon-email Tony J. Puthenpurakal

Abstract

Let (A,m) be a Cohen-Macaulay local ring of dimension d and let I be an m-primary ideal. Let G be the associated graded ring of A with respect to I and let R=A[It,t1] be the extended Rees ring of A with respect to I. Notice t1 is a non-zerononzero divisor on R and R/t1R=G. So, we have Bockstein operators βi:HG+i(1)HG+i+1(G) for i0. Since βi+1(+1)βi=0$, we have Bockstein cohomology modules BHi(G) for i=0,,d. In this paper, we show that certain natural conditions on I implies vanishing of some Bockstein cohomology modules.