EXPONENT MATRICES AND TILED ORDERS OVER DISCRETE VALUATION RINGS
Abstract
Exponent matrices appear in the theory of tiled orders over a discrete valuation ring. Many properties of such an order and its quiver are fully determined by its exponent matrix. We prove that an arbitrary strongly connected simply laced quiver with a loop in every vertex is realized as the quiver of a reduced exponent matrix. The relations between exponent matrices and finite posets, Markov chains, and doubly stochastic matrices are discussed.
Dedicated to Slava Grigorchuk on the occasion of his 50th birthday