# Noon lecture

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On 13.03.2014 at 12:20 in S6, there is the following noon lecture:

# Representative sets for multisets

## Ariel Gabizon

## Abstract

The notion of a q-representative set for a family of subsets, originally arising in the Two-Families Theorem of Bollobás, has recently proven to be very useful in the design of parameterized and exact algorithms.

In this talk I will explain this notion. Then, to illustrate its usefulness, I will show how it was used by Fomin, Lokshtanov and Saurabh to design a fast algorithm for finding long simple paths in a directed graph.

Finally, I will describe a recent work where we generalize the notion of a representative set to a family of multisets and derive algorithmic applications.

Based on joint work with Fedor V. Fomin, Daniel Lokshtanov and Saket Saurabh

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