Mathematics – Commutative Algebra
Scientific paper
2005-02-11
Proceedings of the American Mathematical Society, Volume 134, Number 2, February 2006, pp 313-321
Mathematics
Commutative Algebra
8 pages
Scientific paper
We prove that if $f: (R,\m) \to (S,\n)$ is a flat local homomorphism, $S/\m S$ is Cohen-Macaulay and $F$-injective, and $R$ and $S$ share a weak test element, then a tight closure analogue of the (standard) formula for depth and regular sequences across flat base change holds. As a corollary, it follows that phantom depth commutes with completion for excellent local rings. We give examples to show that the analogue does not hold for surjective base change.
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