On good filtration dimensions for standardly stratified algebras

Details On good filtration dimensions for standardly stratified algebras On good filtration dimensions for standardly stratified algebras

2002-09-06

arxiv.org/abs/math/0209063v3

Mathematics

Rings and Algebras

12 pages

Scientific paper

$\nabla$-good filtration dimensions of modules and of algebras are introduced by Parker for quasi-hereditary algebras. These concepts are now generalized to the setting of standardly stratified algebras. Let $A$ be a standardly stratified algebra. The $\bar{\nabla}$-good filtration dimension of $A$ is proved to be the projective dimension of the characteristic module of $A$. Several characterizations of $\bar{\nabla}$-good filtration dimensions and $\bar{\Delta}$-good filtration dimensions are given for properly stratified algebras. Finally we give an application of these results to the global dimensions of quasi-hereditary algebras with exact Borel subalgebra.

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