Tagungen und Veranstaltungen

 Lisa Sauermann, Dresden
"Der 4-Farben-Satz"
12.2.2010, 14.00 s.t.,  HS 125
Kolloquiumsleiter: Prof. Dr. H.-D. Gronau

Prof. Dr. Bernhard Burgeth, Universität des Saarlandes
"Richtungsabhängige Bildverarbeitung für skalare und matrixwertige Bilder"
24.02.2010, 15:00 Uhr,  Raum 125, Ulmenstr. 69, Haus 3
Kolloquiumsleiter: Prof. Dr. K. Engel

Im Rahmen des Fakultätskolloquiums hält
Herr Prof. Dr. Alexander Meister seine Antrittsvorlesung zum Thema
"Nichtparametrische statistische Modelle"
04.02.2010, 17.00 Uhr, Großer Hörsaal des Institutes für Chemie (Albert-Einstein-Str. 3a)
(Interessenten sind herzlich eingeladen!)

Prof. Dr. Ian Roberts, Univ. Darwin, Australien
"Recent work in Combinatorial Designs and Posets"
Abstract: The talk will focus on recent results or work in progress, and input from the audience will be welcomed. The talk has 3 main components.

1. An introduction to the information available in a computer generated catalogue with Grüttmüller and Rylands. The catalogue is over 30Gb in size. It provides all CSS designs up to 35 points or 7 blocks, or the corresponding dual antichains with up to 35 sets or 7 elements. Summary information is included in the catalogue, producing or counting representatives of various equivalence classes. There is a current opportunity to ask for relevant user-defined structures to be found or counted. For example: What is the smallest size maximal at antichain of 3-sets and 4-sets on [7], and how many non-isomorphic ones are there? For which m; k do k-regular antichains of size m exist on [7]? What are the minimum and maximum possible volumes of minimum size (n; k)CSSs for fixed n; k? The catalogue allows for the development of proofs involving the existence or non-existence of larger structures such as minimum size (n;k)CSSs for n > 35. This will be illustrated. This involves joint work with Gronau, D'Arcy and Dau.
2. A report on work in progress with Leck and Simpson on minimising the size of a union-closed collections generated by a given number of 3-sets. This extends results presented by Leck in July in Rostock.
3. A report on some new work in progress with Johnson, Leck and Hartmann on symmetric-difference-closed collections from the poset perspective, and a possible link with the union-closed sets conjecture. It will also introduce some recent relevant poset calculators by Bezrukov, and which are available on line.

Dr. Zhengyu Wang, Nanjing University, China
"Numerical Validation of Solutions of Interval Linear Variational Inequalities"
13.01.2010, 15:15 Uhr, Ulmenstraße 69, Haus 3, HS 3 (R. 326)
Kolloquiumsleiter: Prof. Dr. G. Mayer