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Projective rational smoothness of varieties of representations for quivers of type $A$

Author: Ralf Schiffler
Journal: Represent. Theory 7 (2003), 549-586
MSC (2000): Primary 17B37; Secondary 32S60, 16G70
Published electronically: November 18, 2003
MathSciNet review: 2017067
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Abstract: Let ${\mathbf U}^+$ be the positive part of the quantized enveloping algebra ${\mathbf U}$of type $A_n$. The change of basis between canonical, and PBW-basis of ${\mathbf U}^+$ has a geometric interpretation in terms of local intersection cohomology of some affine algebraic varieties, namely the Zariski closures of orbits of representations of a quiver of type $A_n$. In this paper we study the local rational smoothness of these orbit closures and, in particular, the rational smoothness of their projectivization.

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Additional Information

Ralf Schiffler
Affiliation: Département de mathématiques, Université du Québec à Montréal, case postale 8888, succursale Centre-Ville, Montréal (Québec), H3C 3P8 Canada

Received by editor(s): October 24, 2002
Received by editor(s) in revised form: September 2, 2003
Published electronically: November 18, 2003
Additional Notes: The author was supported in part by FCAR Grant
Article copyright: © Copyright 2003 American Mathematical Society

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