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A GENERALIZATION OF THE THEORY OF STANDARDLY STRATIFIED ALGEBRAS I: STANDARDLY STRATIFIED RINGOIDS

Published online by Cambridge University Press:  07 October 2020

O. MENDOZA
Affiliation:
Instituto de Matemáticas, Universidad Nacional Autónoma de México, Mexico City, Mexico, Circuito Exterior, Ciudad Universitaria, C.P. 04510, Mexico City, D.F. Mexico, e-mail: omendoza@matem.unam.mx
M. ORTÍZ
Affiliation:
Facultad de Ciencias, Universidad Autónoma del Estado de México, Mexico City, Mexico, e-mail: mortizmo@uaemex.mx
C. SÁENZ
Affiliation:
Departamento de Matemáticas, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico, Circuito Exterior, Ciudad Universitaria, C.P. 04510, Mexico City, D.F. Mexico, e-mails: corina.saenz@gmail.com, valente.santiago.v@gmail.com
V. SANTIAGO
Affiliation:
Departamento de Matemáticas, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico, Circuito Exterior, Ciudad Universitaria, C.P. 04510, Mexico City, D.F. Mexico, e-mails: corina.saenz@gmail.com, valente.santiago.v@gmail.com

Abstract

We extend the classical notion of standardly stratified k-algebra (stated for finite dimensional k-algebras) to the more general class of rings, possibly without 1, with enough idempotents. We show that many of the fundamental results, which are known for classical standardly stratified algebras, can be generalized to this context. Furthermore, new classes of rings appear as: ideally standardly stratified and ideally quasi-hereditary. In the classical theory, it is known that quasi-hereditary and ideally quasi-hereditary algebras are equivalent notions, but in our general setting, this is no longer true. To develop the theory, we use the well-known connection between rings with enough idempotents and skeletally small categories (ringoids or rings with several objects).

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Glasgow Mathematical Journal Trust

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