Torsion classes, wide subcategories and localisations

Abstract

For a finite dimensional algebra $A$, we establish correspondences between torsion classes and wide subcategories in $mod(A)$. In case $A$ is representation finite, we obtain an explicit bijection between these two classes of subcategories. Moreover, we translate our results to the language of ring epimorphisms and universal localisations. It turns out that universal localisations over representation finite algebras are classified by torsion classes and support $\tau$-tilting modules.

13 pages; version 2: new Example 4.7 based on arXiv:1610.05860, small changes in presentation, updated references

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