supported in part by NSF of China (Grant No. 10631010);NKBRPC (Grant No. 2006CB805905)
In this paper, we study the category H (ρ) of semi-stable coherent sheaves of a fixed slope ρ over a weighted projective curve. This category has nice properties: it is a hereditary abelian finitary length category....
supported by National Natural Science Foundation of China(Grant No.10631010);National Key Basic Research Project of China (Grant No.2006CB805905)
Consider the canonical isomorphism between the positive part U+ of the quantum group Uq(g) and the Hall algebra H(Λ),where the semisimple Lie algebra g and the finite-dimensional hereditary algebra Λ share a Dynkin ...
supported by the National Natural Science Foundation of China (No. 10631010) ;the NationalKey Basic Research Programme of China (No. 2006CB805905)
According to the Ringel-Green theorem,the generic composition algebra of the Hall algebra provides a realization of the positive part of the quantum group.Furthermore,its Drinfeld double can be identified with the who...
Supported by NSF of China (Grant No. 10631010);by NKBRPC (Grant No. 2006CB805905)
By using the Ringel-Hall algebra approach, we investigate the structure of the Lie algebra L(A) generated by indecomposable constructible sets in the varieties of modules for any finite- dimensional C-algebra A. We ...