Book of Abstracts
International Conference 13th Serbian Mathematical Congress Book of Abstracts May 22-25, 2014 Vrnjačka Banja, Serbia Organized by Faculty of Sciences and Mathematics, University of Niš, Niš, Serbia in collaboration with: Mathematical Society of Serbia, Belgrade, Serbia Faculty of Mathematics, University of Belgrade, Belgrade, Serbia Faculty of Science, University of Kragujevac, Kragujevac, Serbia Honorary Committee (in alphabetical order) Dragoš Cvetković - Belgrade, Serbia Gradimir Milovanović - Belgrade, Serbia Ivan Gutman - Kragujevac, Serbia Miodrag Petković - Niš, Serbia Aleksandar Ivić - Belgrade, Serbia Stevan Pilipović - Novi Sad, Serbia Milosav Marjanović - Belgrade, Serbia Mileva Prvanović - Belgrade, Serbia Miodrag Mateljević - Belgrade, Serbia Vladimir Rakočević - Niš, Serbia International Scientific Committee Emil Molnar (Budapest, Hungary) David Blair (East Lasing, USA) Aleksandr Vladimirovich Arhangel’skii Dmitri Millionshchikov(Moscow, Russia) (Moscow, Russia) Graham Hall (Aberdeen, UK) Jan van Mill (Amsterdam, Netherlands) Hellmuth Stachel (Vienna, Austria) Boaz Tsaban (Bar Ilan University, Izrael) Sergei Abramovich (Potsdam, NY, USA) Giuseppe Di Maio (Caserta, Italy) Bela Stantic (Brisbane, Australia) Dimitris Georgou (Patras, Greece) Heiko Vogler (Dresden, Germany) Dragan Marušič( (Koper, Slovenia) Vasilios N. Katsikis (Athens, Greece) Francesco Belardo (Messina, Italy) Dimitrios Pappas (Athens, Greece) Manfred Droste (Leipzig, Germany) Victor Buchstaber(Moscow, Russia) Robin Harte (Dublin, Ireland) Anatoly Fomenko (Moscow,
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