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math.AC2004
Independence of the total reflexivity conditions for modules
David Jorgensen, Liana Sega
We show that the conditions defining total reflexivity for modules are independent. In particular, we construct a commutative Noetherian local ring and a reflexive -module $…
math.AC2004
Open loci of graded modules
Christel Rotthaus, Liana M. Sega
Let $A=\oplus_{i\in \nn}A_i$ be an excellent homogeneous Noetherian graded ring and let $M=\oplus_{n\in \zz}M_n$ be a finitely generated graded -module. We consider as a mod…