## Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

# Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

 Mittagsseminar Talk Information

Date and Time: Thursday, November 19, 2015, 12:15 pm

Duration: 30 minutes

Location: CAB G51

Speaker: Vitor Bosshard

## Pseudo Unique Sink Orientations

A unique sink orientation (USO) is a directed version of the hypercube graph $Q_n$ such that every induced subcube has a unique sink.

In this talk I will introduce the notion of a pseudo unique sink orientation (PUSO), a related class of objects arising naturally in the context of the USO recognition problem. I will derive many combinatorial properties of PUSOs, culminating in a characterization of their outmaps.

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