Triangulated categories of matrix factorizations for regular systems of weights with б = _1

摘要

We construct a full strongly exceptional collection in the triangulated category of graded matrix factor_izations of a polynomial associated to a nondegenerate regular system of weights whose smallest exponents are equal to _1. In the associated Grothendieck group, the strongly exceptional collection defines a root basis of a generalized root system of sign (l, 0, 2) and a Coxeter element of finite order, whose primitive eigenvector is a regular element in the expanded symmetric domain of type IV with respect to the Weyl group.