M. Seidali Samani - Faculty of Sciences, Department of Mathematics, University of Mohaghegh Ardabili, P.O. Box ۵۶۱۹۹-۱۱۳۶۷, Ardabil, Iran.
K. Bahmanpour - Faculty of Sciences, Department of Mathematics, University of Mohaghegh Ardabili, P.O. Box ۵۶۱۹۹-۱۱۳۶۷, Ardabil, Iran.

Let R be a commutative Noetherian ring, I an ideal of R and M a non-zero R-module. In this paper we calculate the extension of annihilator of local cohomology modules H^t_I(M), t≥0, under the ring extension R⊂R[X] (resp. R⊂R[[X]]). By using this extension we will present some of the faithfulness conditions of local cohomology modules, and show that if the Lynch s conjecture, in [11], holds in R[[X]], then it will holds in R.

Annihilator, cohomological dimension, Faithfully flat, Local cohomology, Zero-divisor