Geodesic
A duality result for almost split sequences
Colloquium Mathematicum, Tome 80 (1999) no. 2, pp. 267-292
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Over an artinian hereditary ring R, we discuss how the existence of almost split sequences starting at the indecomposable non-injective preprojective right R-modules is related to the existence of almost split sequences ending at the indecomposable non-projective preinjective left R-modules. This answers a question raised by Simson in [27] in connection with pure semisimple rings. 
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Lidia Hügel; Helmut Valenta. A duality result for almost split sequences. Colloquium Mathematicum, Tome 80 (1999) no. 2, pp. 267-292. doi: 10.4064/cm-80-2-267-292

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