Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Thursday, May 26, 2005, 12:15 pm

**Duration**: This information is not available in the database

**Location**: This information is not available in the database

**Speaker**: Gyula Károlyi (Eötvös Lorand University)

According to a classical result due to Cauchy and Davenport, if A and B are sets of congruence classes modulo a prime p, then at least |A|+|B|-1 different classes are represented by the Minkowski sum A+B (unless this number already exceeds the prime p). It is also known that, apart from some trivial or pathological cases, equality occurs only if A and B represent arithmetic progressions of the same difference.

Generalizations of these theorems to commutative groups in general are also widely known. In this talk I will present a natural counterpart of these results for the nonabelian case. The combinatorial proofs depend on the structure of group extensions.

I plan this talk to be pretty self-contained, so even if you forgot most of you may have learnt about groups, you will be able to follow it.

Upcoming talks | All previous talks | Talks by speaker | Upcoming talks in iCal format (beta version!)

Previous talks by year: 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996

Information for students and suggested topics for student talks

Automatic MiSe System Software Version 1.4803M | admin login