文摘
We study support \(\tau \) -tilting modules over preprojective algebras of Dynkin type. We classify basic support \(\tau \) -tilting modules by giving a bijection with elements in the corresponding Weyl groups. Moreover we show that they are in bijection with the set of torsion classes, the set of torsion-free classes and many other important objects in representation theory. We also study \(g\) -matrices of support \(\tau \) -tilting modules, which show terms of minimal projective presentations of indecomposable direct summands. We give an explicit description of \(g\) -matrices and prove that cones given by \(g\) -matrices coincide with chambers of the associated root systems.