Ringel–Hall algebra
In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra, studied by Ringel (1990). It has a basis of equivalence classes of objects of an abelian category, and the structure constants for this basis are related to the numbers of extensions of objects in the category.
References
- George Lusztig, Quivers, perverse sheaves, and quantized enveloping algebras. J. Amer. Math. Soc. 4 (1991), no. 2, 365–421.
- Ringel, Claus Michael (1990), "Hall algebras and quantum groups", Inventiones Mathematicae 101 (3): 583–591, doi:10.1007/BF01231516, MR 1062796
- Schiffmann, O (2006). "Lectures on Hall algebras". arXiv:math/0611617.