Doctoral Program DISCRETE MATHEMATICS Supplement 1 Speaker: Univ.-Prof. Dipl.-Ing. Dr. Wolfgang Woess Institut für Mathematische Strukturthorie, TU Graz Steyrergasse 30 / III, A-8010 GRAZ, AUSTRIA Tel.: ++43 316 873 7130, Fax.: ++43 316 873 4507 email:
[email protected] Deputy Speaker: Ao.Univ.-Prof. Dipl.-Ing. Mag. Dr. Alfred Geroldinger Institut für Mathematik und Wissenschafliches Rechnen, Universität Graz Heinrichstraße 36, A-8010 GRAZ, AUSTRIA Tel.: ++43 316 380 5154 , Fax.: ++43 316 380 9815 email:
[email protected] Deputy Speaker: Ao.Univ.-Prof. Dipl.-Ing. Dr. Jörg Thuswaldner Institut für Mathematik und Informationstechnologie, Montanuniversität Leoben Franz-Josef-Strasse 18, A-8700 Leoben, AUSTRIA Tel.: ++43 3842 402 3805, Fax.: ++43 3842 402 3802 email:
[email protected] Secretary of the Speaker: Christine Stelzer Institut für Mathematische Strukturthorie, Technische Universität Graz Steyrergasse 30 / III, A-8010 GRAZ, AUSTRIA Tel.: ++43 316 873 7131, Fax.: ++43 316 873 4507 email:
[email protected] 57 Supplement 1 (Beilage 1) Description of the Achievements and Goals of the Researchers Contents 1. Project 01: Random walk models on graphs and groups 59 2. Project 02: Probabilistic methods in combinatorial number theory 70 3. Project 03: Additive group theory, zero-sum theory and non-unique factorizations 77 4. Project 04: Fractal analysis and combinatorics of digital expansions 83 5. Project 05: Digital expansions with applications in cryptography 90 6. Project 06: Polynomial diophantine equations - combinatorial and number theoretic aspects 97 7. Project 07: Structural investigations on combinatorial optimization problems 104 8. Project 08: Number systems and fractal structures 115 9.