Triangular objects and systematic K-theory

Abstract

We investigate modules over "systematic" rings. Such rings are "almost graded" and have appeared under various names in the literature; they are special cases of the G-systems of Grzeszczuk. We analyse their K-theory in the presence of conditions on the support, and explain how this generalises and unifies calculations of graded and filtered K-theory scattered in the literature. Our treatment makes systematic use of the formalism of idempotent completion and a theory of triangular objects in additive categories, leading to elementary and transparent proofs throughout.

arXiv comment20 pages

References in corpus (3)

• On Quillen's calculation of graded $K$-theory
• A note on the graded K-theory of certain graded rings
• The equivariant K-theory of toric varieties