arXiv subjects

Christopher J. Pappacena

Publications and source records attributed to Christopher J. Pappacena.

6 recordsLinked to original sources

arXiv2003

Frobenius bimodules between noncommutative spaces

In this paper we study Frobenius bimodules between noncommutative spaces (quasi-schemes), developing some of their basic properties. If X and Y are spaces, we study those Frobenius X,Y-bimodules M satisfying properties that are natural in the context of noncommutative algebraic geometry, focusing in particular on cartain "local" conditions on M. As applications, we prove decomposition and gluing theorems for those Frobenius bimodules which have good local properties. Additionally, when X and Y are schemes we relate Frobenius X,Y-bimodules to the sheaf X,Y-bimodules introduced by Van den Bergh.

math.QA↗

arXiv2002

Affine semiprime algebras of GK dimension one are (still) pi

In this note, we give a new proof of the fact that an affine semiprime algebra R of Gelfand-Kirillov dimension 1 satisfies a polynomial identity. Our proof uses only the growth properties of the algebra and yields an explicit upper bound for the pi degree of R.

math.RA↗

arXiv2002

The BGQ spectral sequence for noncommutative spaces

We prove an analogue of the Brown-Gersten-Quillen (BGQ) spectral sequence for noncommutative spaces. As applications, we consider this spectral sequence for affine and projective spaces associated to right fully bounded noetherian (FBN) rings.

math.QA↗

arXiv2001

Automorphisms of tiled orders

Let Lambda be a tiled R-order. We give a description of Aut_R(Lambda) as the semidirect product of Inn(Lambda) and a certain subgroup of Aut(Q(Lambda)), where Q(Lambda) is the link graph of Lambda. Additionally, we give criteria for determining when an element of Aut(Q(Lambda)) belongs to this subgroup in terms of the exponent matrix for Lambda.

math.RA↗

arXiv2001

Strongly graded hereditary orders

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 by the first author and G. Janusz (Trans. Amer. Math. Soc. 352 (2000), 3381-3410).

math.RA↗

arXiv2001

The injective spectrum of a noncommutative space

For a noncommutative space X, we study Inj(X), the set of isomorphism classes of indecomposable injective X-modules. In particular, we look at how this set, suitably topologized, can be viewed as an underlying "spectrum" for X. As applications we discuss noncommutative notions of irreducibility and integrality, and a way of associating an integral subspace of X to each element of Inj(X) which behaves like a "weak point."

math.QA↗