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Regularity and intersections of bracket powers

Neil Epstein (2022)

Czechoslovak Mathematical Journal

Among reduced Noetherian prime characteristic commutative rings, we prove that a regular ring is precisely that where the finite intersection of ideals commutes with taking bracket powers. However, reducedness is essential for this equivalence. Connections are made with Ohm-Rush content theory, intersection-flatness of the Frobenius map, and various flatness criteria.

Relative Buchsbaumness of bigraded modules

Keivan Borna, Ahad Rahimi, Syrous Rasoulyar (2012)

Colloquium Mathematicae

We study finitely generated bigraded Buchsbaum modules over a standard bigraded polynomial ring with respect to one of the irrelevant bigraded ideals. The regularity and the Hilbert function of graded components of local cohomology at the finiteness dimension level are considered.

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