Counting Unique-Sink Orientations

Unique-sink orientations (USOs) are an abstract class of orientations of the ncube graph. We consider some classes of USOs that are of interest in connection with the linear complementarity problem. We summarise old and show new lower and upper bounds on the sizes of some such classes. Furthermore, we provide a characterisation of K-matrices in terms of their corresponding USOs.

• Type: Journal
• Year: 2010
• Where: CORR
• Authors: Jan Foniok, Bernd Gärtner, Lorenz Klaus, Markus Sprecher
• Keywords: CORR 2010, Education, Linear Complementarity Problem, Unique-sink Orientations, USOs