Browsing Jeremy Haefner (2008 - ) by Title
Now showing items 1-13 of 13
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Approximating rings with local units via automorphisms
(Springer Verlag, 1999-02)For a ring A with local units we investigate unital overrings T of A, and compare the automorphism groups Aut(A) and Aut(T ). -
Automorphisms of tiled orders
(Elsevier, 2002)Let Λ be a tiled R-order. We give a description of AutR(Λ) as the semidirect product of Inn(Λ) and a certain subgroup of Aut(Q(Λ)), where Q(Λ) is the link graph of Λ. Additionally, we give criteria for determining when ... -
The Globalization problem for inner automorphisms and Skolem-Noether theorems
(World Science, 2003-07)We investigate the circumstances under which an inner automorphism of a ring with local units can be built from “local” information. Specifically, we consider three natural “inner” type properties for an automorphism of ... -
Graded equivalence theory with applications
(Elsevier, 1995-03-01)We develop the foundations for graded equivalence theory and apply them to investigate properties such as primeness, finite representation type, and vertex theory of graded rings. The key fact that we prove is that, for ... -
Hereditary crossed products
(American Mathmatical Society, 2000-03-27)We characterize when a crossed product order over a maximal order in a central simple algebra by a finite group is hereditary. We need only concentrate on the cases when the group acts as inner automorphisms and when ... -
The Isomorphism problem for incidence rings
(University of California, 1999)Let P and P’ be finite preordered sets, and let R be a ring for which the number of nonzero summands in a direct decomposition of the regular module RR is bounded. We show that if the incidence rings I(P;R) and I(P’;R) ... -
Isomorphisms of row and column finite matrix rings
(American Mathmatical Society, 1997-06)This paper investigates the ring-theoretic similarities and the cate- gorical dissimilarities between the ring RFM(R) of row finite matrices and the ring RCFM(R) of row and column finite matrices. For example, we prove ... -
Local orders whose lattices are direct sums of ideals
(American Mathematical Society, 1990-10)Let R be a complete local Dedekind domain with quotient field K and let A be a local R-order in a separable K-algebra. This paper classifies those orders A such that every indecomposable R-torsionfree A-module is isomorphic ... -
Mind over matter: Transforming course management systems into effective learning environments
(EDUCAUSE, 2002-12)Integrating best practices for "deeper learning" with the robust tools provided by course management systems creates an incredibly effective, engaging, and student-centered learning environment. -
On when a graded ring is graded equivalent to a crossed product
(American Mathmatical Society, 1996-04)Let R be a ring graded by a group G. We are concerned with describing those G-graded rings that are graded equivalent to G-crossed products. We give necessary and sufficient conditions for when a strongly graded ring ... -
Strongly graded hereditary orders
(2001-08-28)Let R be a Dedekind domain with global quotient field K. The purpose of this note is to provide a characterization of when a strongly graded R-order with semiprime 1-component is hereditary. This generalizes earlier work ...