# Background

At the Swedish election in September 2010 the distribution of seats in the Swedish Riksdag was not as proportional to the number of votes the parties had gotten as it could have been. Proportionality is the intention in the Swedish law and the unproportionality came as a great surprise to most Swedes. The same thing happened in 9 of the 20 elections for county councils (landsting). The reason for this is the way the Swedish election law tries to ensure reasonable proportionality also between various regions of Sweden. This workshop will discuss various election methods. One important topic will be advantages and disadvantages of various methods to achieve reasonable proportionality both for parties and for regions, but many other topics will also be discussed. Both mathematical and political aspects will be treated. This document gives a brief explanation of the Swedish election system.# Registration

Participation is free of charge. However, participation in the conference dinner is by invitation only. If you intend to attend some (or all) of the lectures, please register by sending an e-mail to valmatematik@gmail.com.# Location

The workshop will take place during May 30-31 at the Royal Institute of Technology (KTH) in Stockholm. All lectures will be held in lecture hall K2. There are more precise directions given below.# Schedule

Click the name of the speaker for abstract, title for slides from the corresponding talk.Hylland's talk was replaced by Janson's talk (so there was no talk 16.30 on Monday.) The schedule for Tuesday is unchanged.

Friedrich Pukelsheim has kindly shared the photos he took during the workshop. They can be viewed here and downloaded in one package here.

# Invited Speakers

Prof. Michel Balinski, Mathematics, Ecole Polytechnique, FranceProf. Paul Edelman, Mathematics and Law, Vanderbilt University, USA

Prof. Jørgen Elklit, Political Science, University of Aarhus, Denmark

Dr. Polit. Gunnvald Grønvik, Political Science, Norway.

Prof. Aanund Hylland, Economics, University of Oslo, Norway

Prof. Iain McLean, Political Science, University of Oxford, Great Britain

Prof. Hannu Nurmi, Political Science, University of Turku, Finland

Prof. Friedrich Pukelsheim, Mathematics, University of Augsburg, Germany

Prof. Victoriano Ramirez, Applied Mathematics, University of Granada, Spain

Prof. Martin Zachariasen, Computer science, University of Copenhagen

Prof. Jörgen Hermansson, Political science, Uppsala University

Prof. Svante Janson, Mathematics, Uppsala University

Prof. Jan Lanke, Statistics, Lund University

Prof. Svante Linusson, Mathematics, KTH, Stockholm

Prof. Henrik Oscarsson, Political Science, University of Gothenburg

# Organizers

Prof. Svante Linusson, Mathematics, KTH (chair)Prof. Svante Janson Mathematics, Uppsala University

Prof. Boualem Djehieche, Mathematical Statistics, KTH

Prof. Jörgen Weibull, Economics, Stockholm School of Economics (Handelshögskolan) and KTH

Erik Aas, Mathematics, KTH

# Sponsor

The sole sponsor of the workshop is Riksbankens Jubileumsfond, whose support is gratefully acknowledged.# Links

Ways to escape from this page.# Navigating Stockholm

## From almost anywhere to KTH

Here's the location of the math department. This page explains how to get from various places to the math department at KTH.## From T-Centralen to Hotel Arcadia (which is quite close to KTH)

T-Centralen is the name of the main railway station in Stockholm. Below is a link to a map describing a path from T-Centralen (A) to Hotel Arcadia (B), where some of the participants will be hosted during the workshop.Link to a map

The address of Hotel Arcadia is Körsbärsvägen 1. One good way to get from T-centralen to Hotel Arcadia is to go by metro (metro stations are indicated by blue 'T':s on white circular backgrounds, both on the map and in the real world). To do this, go to T-Centralen metro station (which is adjacent to T-Centralen train station), take red line number 14 (there are two red lines, only 14 will work. The two red lines share the same track.) going towards "Mörby Centrum" (there are two directions, only this one will work). Get off the train at "Tekniska Högskolan" (KTH). Get out of the metro station in the direction indicated by the signs saying "Körbärsvägen". Now you are really close.

Contact: valmatematik@gmail.com