Extension-orthogonal components of preprojective varieties
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- by Christof Geiß and Jan Schröer PDF
- Trans. Amer. Math. Soc. 357 (2005), 1953-1962 Request permission
Abstract:
Let $Q$ be a Dynkin quiver, and let $\Lambda$ be the corresponding preprojective algebra. Let ${\mathcal C} = \{ C_i \mid i \in I \}$ be a set of pairwise different indecomposable irreducible components of varieties of $\Lambda$-modules such that generically there are no extensions between $C_i$ and $C_j$ for all $i,j$. We show that the number of elements in ${\mathcal C}$ is at most the number of positive roots of $Q$. Furthermore, we give a module-theoretic interpretation of Leclerc’s counterexample to a conjecture of Berenstein and Zelevinsky.References
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Additional Information
- Christof Geiß
- Affiliation: Instituto de Matemáticas, UNAM, Ciudad Universitaria, 04510 Mexico D.F., Mexico
- MR Author ID: 326818
- Email: christof@math.unam.mx
- Jan Schröer
- Affiliation: Department of Pure Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom
- MR Author ID: 633566
- Email: jschroer@maths.leeds.ac.uk
- Received by editor(s): September 5, 2002
- Received by editor(s) in revised form: October 7, 2003
- Published electronically: August 11, 2004
- Additional Notes: The second author thanks the Nuffield Foundation (Grant Number NAL/00270/G) for financial support, and the IM UNAM, Mexico City, where most of this work was done
- © Copyright 2004 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 357 (2005), 1953-1962
- MSC (2000): Primary 14M99, 16D70, 16G20, 17B37
- DOI: https://doi.org/10.1090/S0002-9947-04-03555-X
- MathSciNet review: 2115084